Unable to use 'fit' function from Curve Fitting Toolbox

When I try to use the fit() function from Curve Fitting Toolbox I get the error "Unrecognized function or variable 'fit'." I am trying to call it with the following code:

f = fit(X, Y, 'exp2');

where the variables X and Y are each matrices with a single column of the same size, of the 'double' class. I get the same error regardless of what fit option I specify with the string that is the 3rd input variable. I have verified that the toolbox is on path and have uninstalled/reinstalled just in case. When I enter "help fit" it displays the documentation for the function, so that also seems to confirm that the function is installed correctly and seen by Matlab.

I am using Matlabl R2021b and the Curve Fitting Toolbox is version 3.6....

Any other troubleshooting ideas?

[dpb]

which -all fit

is always first thing to look for...

[daruke]

Thanks this was helpful for troubleshooting. It turns out the problem was that later in the function, a variable named "fit" was being created. It took me a while to catch this, bc the variable "fit" was being created much later in an unrelated part of the function that I don't ever look at, and the error message had me considering installation/path issues.

Answer 1

[John D'Errico]

Is fit giving you fits?

First, check that MATLAB thinks the curvefitting toolbox is installed, and that you have a license for it. Do that by use of the ver command, in the command window. While you might THINK you have it installed, maybe you did not install it properly. So is it there?

ver

-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.13.0.2182233 (R2022b) Update 4
MATLAB License Number: 0
Operating System: Linux 5.4.224-0504224-generic #202211101403 SMP Thu Nov 10 21:10:29 UTC 2022 x86_64
Java Version: Java 1.8.0_292-b10 with AdoptOpenJDK OpenJDK 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.13        (R2022b)
Simulink                                              Version 10.6        (R2022b)
5G Toolbox                                            Version 2.5         (R2022b)
Aerospace Blockset                                    Version 5.3         (R2022b)
Aerospace Toolbox                                     Version 4.3         (R2022b)
Antenna Toolbox                                       Version 5.3         (R2022b)
Audio Toolbox                                         Version 3.3         (R2022b)
Automated Driving Toolbox                             Version 3.6         (R2022b)
Bioinformatics Toolbox                                Version 4.16.1      (R2022b)
Bluetooth Toolbox                                     Version 1.1         (R2022b)
Communications Toolbox                                Version 7.8         (R2022b)
Computer Vision Toolbox                               Version 10.3        (R2022b)
Control System Toolbox                                Version 10.12       (R2022b)
Curve Fitting Toolbox                                 Version 3.8         (R2022b)
DO Qualification Kit                                  Version 3.14        (R2022b)
DSP System Toolbox                                    Version 9.15        (R2022b)
Database Toolbox                                      Version 10.4        (R2022b)
Datafeed Toolbox                                      Version 6.3         (R2022b)
Deep Learning Toolbox                                 Version 14.5        (R2022b)
Econometrics Toolbox                                  Version 6.1         (R2022b)
Embedded Coder                                        Version 7.9         (R2022b)
Filter Design HDL Coder                               Version 3.1.12      (R2022b)
Financial Instruments Toolbox                         Version 3.5         (R2022b)
Financial Toolbox                                     Version 6.4         (R2022b)
Fixed-Point Designer                                  Version 7.5         (R2022b)
Fuzzy Logic Toolbox                                   Version 3.0         (R2022b)
Global Optimization Toolbox                           Version 4.8         (R2022b)
HDL Coder                                             Version 4.0         (R2022b)
HDL Verifier                                          Version 7.0         (R2022b)
IEC Certification Kit                                 Version 3.20        (R2022b)
Image Acquisition Toolbox                             Version 6.7         (R2022b)
Image Processing Toolbox                              Version 11.6        (R2022b)
Industrial Communication Toolbox                      Version 6.1         (R2022b)
Instrument Control Toolbox                            Version 4.7         (R2022b)
LTE Toolbox                                           Version 3.8         (R2022b)
MATLAB Compiler                                       Version 8.5         (R2022b)
MATLAB Compiler SDK                                   Version 7.1         (R2022b)
MATLAB Report Generator                               Version 5.13        (R2022b)
Mapping Toolbox                                       Version 5.4         (R2022b)
Mixed-Signal Blockset                                 Version 2.3         (R2022b)
Model Predictive Control Toolbox                      Version 8.0         (R2022b)
Navigation Toolbox                                    Version 2.3         (R2022b)
Optimization Toolbox                                  Version 9.4         (R2022b)
Parallel Computing Toolbox                            Version 7.7         (R2022b)
Partial Differential Equation Toolbox                 Version 3.9         (R2022b)
Phased Array System Toolbox                           Version 4.8         (R2022b)
Powertrain Blockset                                   Version 1.12        (R2022b)
Predictive Maintenance Toolbox                        Version 2.6         (R2022b)
RF Blockset                                           Version 8.4         (R2022b)
RF Toolbox                                            Version 4.4         (R2022b)
Requirements Toolbox                                  Version 2.1         (R2022b)
Risk Management Toolbox                               Version 2.1         (R2022b)
Robotics System Toolbox                               Version 4.1         (R2022b)
Robust Control Toolbox                                Version 6.11.2      (R2022b)
Sensor Fusion and Tracking Toolbox                    Version 2.4         (R2022b)
SerDes Toolbox                                        Version 2.4         (R2022b)
Signal Processing Toolbox                             Version 9.1         (R2022b)
SimBiology                                            Version 6.4         (R2022b)
SimEvents                                             Version 5.13        (R2022b)
Simscape                                              Version 5.4         (R2022b)
Simscape Driveline                                    Version 3.6         (R2022b)
Simscape Electrical                                   Version 7.8         (R2022b)
Simscape Fluids                                       Version 3.5         (R2022b)
Simscape Multibody                                    Version 7.6         (R2022b)
Simulink 3D Animation                                 Version 9.5         (R2022b)
Simulink Check                                        Version 6.1         (R2022b)
Simulink Code Inspector                               Version 4.2         (R2022b)
Simulink Coder                                        Version 9.8         (R2022b)
Simulink Control Design                               Version 6.2         (R2022b)
Simulink Coverage                                     Version 5.5         (R2022b)
Simulink Design Optimization                          Version 3.12        (R2022b)
Simulink Design Verifier                              Version 4.8         (R2022b)
Simulink PLC Coder                                    Version 3.7         (R2022b)
Simulink Real-Time                                    Version 8.1         (R2022b)
Simulink Report Generator                             Version 5.13        (R2022b)
Simulink Test                                         Version 3.7         (R2022b)
Stateflow                                             Version 10.7        (R2022b)
Statistics and Machine Learning Toolbox               Version 12.4        (R2022b)
Symbolic Math Toolbox                                 Version 9.2         (R2022b)
System Identification Toolbox                         Version 10.0        (R2022b)
Text Analytics Toolbox                                Version 1.9         (R2022b)
Vehicle Dynamics Blockset                             Version 1.9         (R2022b)
Vehicle Network Toolbox                               Version 5.3         (R2022b)
Vision HDL Toolbox                                    Version 2.6         (R2022b)
WLAN Toolbox                                          Version 3.5         (R2022b)
Wavelet Toolbox                                       Version 6.2         (R2022b)
Wireless HDL Toolbox                                  Version 2.5         (R2022b)

That should list the CFTB. Next, check to see if fit is there.

which fit -all

/MATLAB/toolbox/curvefit/curvefit/fit.m
/MATLAB/toolbox/stats/stats/@gmdistribution/fit.m  % gmdistribution method

You should see something like that. If not, then you have a problem.

Did you zap fit.m? That would be a bad thing, in which case you would need to re-download the CFTB. Did you move fit? You should NEVER move files from their directories as supplied.

You could also check your search path. Is the curvefit directory on your search path? It should be listed here:

path

		MATLABPATH

	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/addpath
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/codegen
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/gpucoder
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/home
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/input
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/keyboard
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/license
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/more
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/opentoline+common
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/pause+mobile_cloud
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/simulink
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/slLibraryBrowser
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/ver
	/MATLAB/toolbox/matlab/connector2/shadowfiles/shadows/shadowtest
	/MATLAB/toolbox/matlab/addon_enable_disable_management/matlab
	/MATLAB/toolbox/matlab/addon_updates/matlab
	/MATLAB/toolbox/matlab/addons
	/MATLAB/toolbox/matlab/addons/cef
	/MATLAB/toolbox/matlab/addons/fileexchange
	/MATLAB/toolbox/matlab/addons/supportpackages
	/MATLAB/toolbox/matlab/addons_common/matlab
	/MATLAB/toolbox/matlab/addons_install_location/matlab
	/MATLAB/toolbox/matlab/addons_product
	/MATLAB/toolbox/matlab/addons_registry/matlab
	/MATLAB/toolbox/matlab/addressbar_plugins/browse_for_folder_button/matlab
	/MATLAB/toolbox/matlab/addressbar_plugins/cd_up_one_dir_button/matlab
	/MATLAB/toolbox/matlab/appcontainer
	/MATLAB/toolbox/matlab/appdesigner/appdesigner
	/MATLAB/toolbox/matlab/appdesigner/appdesigner/interface
	/MATLAB/toolbox/matlab/appdesigner/appdesigner/runtime
	/MATLAB/toolbox/matlab/appdesigner/comparisons/mldesktop_m
	/MATLAB/toolbox/matlab/appdesigner/matlab_integration/cfb/cfb
	/MATLAB/toolbox/matlab/apps
	/MATLAB/toolbox/matlab/audiovideo
	/MATLAB/toolbox/matlab/bigdata
	/MATLAB/toolbox/matlab/bluetooth
	/MATLAB/toolbox/matlab/buildtool/core
	/MATLAB/toolbox/matlab/buildtool/ext
	/MATLAB/toolbox/matlab/capabilities
	/MATLAB/toolbox/matlab/cefclient
	/MATLAB/toolbox/matlab/codeanalysis/analyzerrpt/backend
	/MATLAB/toolbox/matlab/codeanalysis/reports/analysis
	/MATLAB/toolbox/matlab/codeanalysis/tools
	/MATLAB/toolbox/matlab/codetools
	/MATLAB/toolbox/matlab/codetools/embeddedoutputs
	/MATLAB/toolbox/matlab/codetools/embeddedoutputs/DataToolsRegistration
	/MATLAB/toolbox/matlab/codetools/liveapps
	/MATLAB/toolbox/matlab/configtools
	/MATLAB/toolbox/matlab/connector2/binary
	/MATLAB/toolbox/matlab/connector2/common
	/MATLAB/toolbox/matlab/connector2/configuration
	/MATLAB/toolbox/matlab/connector2/connector
	/MATLAB/toolbox/matlab/connector2/editor
	/MATLAB/toolbox/matlab/connector2/figures
	/MATLAB/toolbox/matlab/connector2/http
	/MATLAB/toolbox/matlab/connector2/interpreter
	/MATLAB/toolbox/matlab/connector2/logger
	/MATLAB/toolbox/matlab/connector2/messageservice
	/MATLAB/toolbox/matlab/connector2/mgg
	/MATLAB/toolbox/matlab/connector2/nativebridge
	/MATLAB/toolbox/matlab/connector2/restmatlab
	/MATLAB/toolbox/matlab/connector2/session
	/MATLAB/toolbox/matlab/connector2/shadowfiles
	/MATLAB/toolbox/matlab/connector2/webwindow/m
	/MATLAB/toolbox/matlab/connector2/worker
	/MATLAB/toolbox/matlab/datafun
	/MATLAB/toolbox/matlab/datamanager
	/MATLAB/toolbox/matlab/datastoreio
	/MATLAB/toolbox/matlab/datatools/datatoolsservices/matlab
	/MATLAB/toolbox/matlab/datatools/desktop_importtool/matlab
	/MATLAB/toolbox/matlab/datatools/desktop_variableeditor/matlab
	/MATLAB/toolbox/matlab/datatools/desktop_workspacebrowser/matlab
	/MATLAB/toolbox/matlab/datatools/editorconverters/matlab
	/MATLAB/toolbox/matlab/datatools/importtool/matlab/peer
	/MATLAB/toolbox/matlab/datatools/importtool/matlab/server
	/MATLAB/toolbox/matlab/datatools/inspector/matlab
	/MATLAB/toolbox/matlab/datatools/inspector/registration
	/MATLAB/toolbox/matlab/datatools/matlab_integration/cfb/matlab
	/MATLAB/toolbox/matlab/datatools/media_widgets/matlab
	/MATLAB/toolbox/matlab/datatools/peermodel_mcos/matlab
	/MATLAB/toolbox/matlab/datatools/plotstab/matlab
	/MATLAB/toolbox/matlab/datatools/preprocessing
	/MATLAB/toolbox/matlab/datatools/variableeditor/matlab
	/MATLAB/toolbox/matlab/datatools/widgets/matlab
	/MATLAB/toolbox/matlab/datatools/workspacebrowser/matlab
	/MATLAB/toolbox/matlab/datatypes
	/MATLAB/toolbox/matlab/datatypes/applyfuns
	/MATLAB/toolbox/matlab/datatypes/calendarDuration
	/MATLAB/toolbox/matlab/datatypes/categorical
	/MATLAB/toolbox/matlab/datatypes/cell
	/MATLAB/toolbox/matlab/datatypes/cell_nonlibmatlab
	/MATLAB/toolbox/matlab/datatypes/codegen/categorical
	/MATLAB/toolbox/matlab/datatypes/codegen/datetime
	/MATLAB/toolbox/matlab/datatypes/codegen/duration
	/MATLAB/toolbox/matlab/datatypes/codegen/tabular
	/MATLAB/toolbox/matlab/datatypes/datetime
	/MATLAB/toolbox/matlab/datatypes/datetime_nonlibmatlab
	/MATLAB/toolbox/matlab/datatypes/dictionary
	/MATLAB/toolbox/matlab/datatypes/duration
	/MATLAB/toolbox/matlab/datatypes/shared/codegen
	/MATLAB/toolbox/matlab/datatypes/shared/matlab_datatypes
	/MATLAB/toolbox/matlab/datatypes/struct
	/MATLAB/toolbox/matlab/datatypes/tabular
	/MATLAB/toolbox/matlab/dataui
	/MATLAB/toolbox/matlab/ddux
	/MATLAB/toolbox/matlab/debugger
	/MATLAB/toolbox/matlab/demos
	/MATLAB/toolbox/matlab/dependency/analysis
	/MATLAB/toolbox/matlab/dependency/app
	/MATLAB/toolbox/matlab/dependency/attribute
	/MATLAB/toolbox/matlab/dependency/comparisons/mldesktop/matlab
	/MATLAB/toolbox/matlab/dependency/matlab
	/MATLAB/toolbox/matlab/dependency/refactoring
	/MATLAB/toolbox/matlab/dependency/report
	/MATLAB/toolbox/matlab/dependency/widget/progress
	/MATLAB/toolbox/matlab/dependency/widget/progress_web
	/MATLAB/toolbox/matlab/dependency/widget/window
	/MATLAB/toolbox/matlab/depfun
	/MATLAB/toolbox/matlab/editor/cfb_integration/editor_actions/matlab
	/MATLAB/toolbox/matlab/editor/cfb_integration/editor_filetype_icons/matlab
	/MATLAB/toolbox/matlab/editor/cfb_integration/editor_filetype_labels/matlab
	/MATLAB/toolbox/matlab/editor_addons/matlab_unit/matlab
	/MATLAB/toolbox/matlab/editor_addons/system_object/matlab
	/MATLAB/toolbox/matlab/elfun
	/MATLAB/toolbox/matlab/elmat
	/MATLAB/toolbox/matlab/embeddedoutputs/figureoutputs
	/MATLAB/toolbox/matlab/embeddedoutputs/outputs
	/MATLAB/toolbox/matlab/embeddedoutputs/outpututilities
	/MATLAB/toolbox/matlab/embeddedoutputs/variableoutputs
	/MATLAB/toolbox/matlab/external/engines/codegen
	/MATLAB/toolbox/matlab/external/engines/engine_api
	/MATLAB/toolbox/matlab/external/interfaces/cpp
	/MATLAB/toolbox/matlab/external/interfaces/java/jmi
	/MATLAB/toolbox/matlab/external/interfaces/json
	/MATLAB/toolbox/matlab/external/interfaces/python
	/MATLAB/toolbox/matlab/external/interfaces/webservices
	/MATLAB/toolbox/matlab/external/interfaces/webservices/http
	/MATLAB/toolbox/matlab/external/interfaces/webservices/restful
	/MATLAB/toolbox/matlab/external/interfaces/webservices/wsdl
	/MATLAB/toolbox/matlab/external/mex
	/MATLAB/toolbox/matlab/file_chooser/service/matlab
	/MATLAB/toolbox/matlab/filebrowser
	/MATLAB/toolbox/matlab/filesystem/default_filetype_plugins/file_plugin
	/MATLAB/toolbox/matlab/filesystem/default_filetype_plugins/folder_plugin
	/MATLAB/toolbox/matlab/filesystem/matlab_filetype_filters/filetypefilters
	/MATLAB/toolbox/matlab/filesystem/services/matlab
	/MATLAB/toolbox/matlab/findfiles/m
	/MATLAB/toolbox/matlab/funfun
	/MATLAB/toolbox/matlab/general
	/MATLAB/toolbox/matlab/graph2d
	/MATLAB/toolbox/matlab/graph3d
	/MATLAB/toolbox/matlab/graphfun
	/MATLAB/toolbox/matlab/graphfun/codegen
	/MATLAB/toolbox/matlab/graphics
	/MATLAB/toolbox/matlab/graphics/annotation
	/MATLAB/toolbox/matlab/graphics/axis
	/MATLAB/toolbox/matlab/graphics/chart
	/MATLAB/toolbox/matlab/graphics/color
	/MATLAB/toolbox/matlab/graphics/function
	/MATLAB/toolbox/matlab/graphics/hg
	/MATLAB/toolbox/matlab/graphics/illustration
	/MATLAB/toolbox/matlab/graphics/legacy
	/MATLAB/toolbox/matlab/graphics/maps
	/MATLAB/toolbox/matlab/graphics/math
	/MATLAB/toolbox/matlab/graphics/objectsystem
	/MATLAB/toolbox/matlab/graphics/obsolete
	/MATLAB/toolbox/matlab/graphics/primitive
	/MATLAB/toolbox/matlab/graphics/printing
	/MATLAB/toolbox/matlab/guide
	/MATLAB/toolbox/matlab/hardware/stubs
	/MATLAB/toolbox/matlab/helptools
	/MATLAB/toolbox/matlab/helptools/reference
	/MATLAB/toolbox/matlab/helptools_js/link_click_handling_docservice/m
	/MATLAB/toolbox/matlab/helptools_js/matlab_colon_docservice/m
	/MATLAB/toolbox/matlab/htmlviewer
	/MATLAB/toolbox/matlab/icons
	/MATLAB/toolbox/matlab/images
	/MATLAB/toolbox/matlab/imagesci
	/MATLAB/toolbox/matlab/indentcode/m
	/MATLAB/toolbox/matlab/indexing
	/MATLAB/toolbox/matlab/io/archive
	/MATLAB/toolbox/matlab/io/arrow
	/MATLAB/toolbox/matlab/io/common
	/MATLAB/toolbox/matlab/io/datastore/array
	/MATLAB/toolbox/matlab/io/datastore/common
	/MATLAB/toolbox/matlab/io/datastore/file
	/MATLAB/toolbox/matlab/io/datastore/fileset
	/MATLAB/toolbox/matlab/io/datastore/image
	/MATLAB/toolbox/matlab/io/datastore/keyvalue
	/MATLAB/toolbox/matlab/io/datastore/legacy
	/MATLAB/toolbox/matlab/io/datastore/parquet
	/MATLAB/toolbox/matlab/io/datastore/range
	/MATLAB/toolbox/matlab/io/datastore/spreadsheet
	/MATLAB/toolbox/matlab/io/datastore/tall
	/MATLAB/toolbox/matlab/io/datastore/text
	/MATLAB/toolbox/matlab/io/filesystem
	/MATLAB/toolbox/matlab/io/filter
	/MATLAB/toolbox/matlab/io/ftp
	/MATLAB/toolbox/matlab/io/functions
	/MATLAB/toolbox/matlab/io/html
	/MATLAB/toolbox/matlab/io/interface
	/MATLAB/toolbox/matlab/io/parquet
	/MATLAB/toolbox/matlab/io/spreadsheet
	/MATLAB/toolbox/matlab/io/text
	/MATLAB/toolbox/matlab/io/word
	/MATLAB/toolbox/matlab/io/xml
	/MATLAB/toolbox/matlab/iofun
	/MATLAB/toolbox/matlab/iot
	/MATLAB/toolbox/matlab/iot/connectivity
	/MATLAB/toolbox/matlab/lang
	/MATLAB/toolbox/matlab/licensing
	/MATLAB/toolbox/matlab/login
	/MATLAB/toolbox/matlab/mapreduceio
	/MATLAB/toolbox/matlab/maps
	/MATLAB/toolbox/matlab/matfun
	/MATLAB/toolbox/matlab/matlab_preferences/matlab
	/MATLAB/toolbox/matlab/mex
	/MATLAB/toolbox/matlab/mpm
	/MATLAB/toolbox/matlab/mvm
	/MATLAB/toolbox/matlab/network
	/MATLAB/toolbox/matlab/networklib
	/MATLAB/toolbox/matlab/networklib/apps/tcpclientapp
	/MATLAB/toolbox/matlab/notifications/notifications_center_ui/matlab
	/MATLAB/toolbox/matlab/object_serialization_customization
	/MATLAB/toolbox/matlab/ops
	/MATLAB/toolbox/matlab/optimfun
	/MATLAB/toolbox/matlab/optimfun/gui
	/MATLAB/toolbox/matlab/oss
	/MATLAB/toolbox/matlab/parallel
	/MATLAB/toolbox/matlab/pathtool
	/MATLAB/toolbox/matlab/plottools
	/MATLAB/toolbox/matlab/plottools/inspector
	/MATLAB/toolbox/matlab/polyfun
	/MATLAB/toolbox/matlab/preferences/addonspanel
	/MATLAB/toolbox/matlab/preferences/fonts
	/MATLAB/toolbox/matlab/preferences/variablesprefpanel/variablesprefpanel-ui
	/MATLAB/toolbox/matlab/preferences/workspaceprefpanel/workspaceprefpanel-ui
	/MATLAB/toolbox/matlab/profileviewer
	/MATLAB/toolbox/matlab/project
	/MATLAB/toolbox/matlab/project/api
	/MATLAB/toolbox/matlab/project/cfbfileinfoplugin/matlab
	/MATLAB/toolbox/matlab/project/comparison
	/MATLAB/toolbox/matlab/project/creation/fromarchive
	/MATLAB/toolbox/matlab/project/creation/fromfile
	/MATLAB/toolbox/matlab/project/dependency
	/MATLAB/toolbox/matlab/project/example
	/MATLAB/toolbox/matlab/project/preferences
	/MATLAB/toolbox/matlab/project/refactoring
	/MATLAB/toolbox/matlab/project/toolstrip
	/MATLAB/toolbox/matlab/project/unsavedchanges
	/MATLAB/toolbox/matlab/project/views/action_web/project-action-ui/matlab
	/MATLAB/toolbox/matlab/project/views/core
	/MATLAB/toolbox/matlab/project/views/labels
	/MATLAB/toolbox/matlab/project/views/references
	/MATLAB/toolbox/matlab/project/views/unsavedchanges
	/MATLAB/toolbox/matlab/project/views/util
	/MATLAB/toolbox/matlab/randfun
	/MATLAB/toolbox/matlab/registration_framework/matlab
	/MATLAB/toolbox/matlab/reports
	/MATLAB/toolbox/matlab/resources_folder
	/MATLAB/toolbox/matlab/richcontent_preview/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_clike_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_java_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_js_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_mlike_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_python_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_tlc_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_verilog_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_vhdl_language_support/matlab
	/MATLAB/toolbox/matlab/rtc_addons/rtclanguagesupport/rtc_xml_language_support/matlab
	/MATLAB/toolbox/matlab/scribe
	/MATLAB/toolbox/matlab/scribe/obsolete
	/MATLAB/toolbox/matlab/serial
	/MATLAB/toolbox/matlab/serialport
	/MATLAB/toolbox/matlab/serialport/apps/serialportapp
	/MATLAB/toolbox/matlab/sparfun
	/MATLAB/toolbox/matlab/specfun
	/MATLAB/toolbox/matlab/specgraph
	/MATLAB/toolbox/matlab/storage/matlabdrive
	/MATLAB/toolbox/matlab/storage/mldrivedesktop
	/MATLAB/toolbox/matlab/storage/mldrivejsplugins/matlabdrive_js/matlab
	/MATLAB/toolbox/matlab/storage/mldrivejsplugins/share_folder_preview/matlab
	/MATLAB/toolbox/matlab/storage/mldrivejsplugins/sharing_actions/matlab
	/MATLAB/toolbox/matlab/storage/mldrivejsplugins/tripwire_button/matlab
	/MATLAB/toolbox/matlab/strfun
	/MATLAB/toolbox/matlab/strfun/pattern
	/MATLAB/toolbox/matlab/strfun/validators
	/MATLAB/toolbox/matlab/supportpackagemanagement
	/MATLAB/toolbox/matlab/system
	/MATLAB/toolbox/matlab/system/editor
	/MATLAB/toolbox/matlab/taskpool
	/MATLAB/toolbox/matlab/testframework/measurement/core
	/MATLAB/toolbox/matlab/testframework/measurement/ext
	/MATLAB/toolbox/matlab/testframework/mock/core
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So start with the basic tests, and see where fit went.

[daruke]

Thanks this was helpful for troubleshooting. It turns out the problem was that later in the function, a variable named "fit" was being created. It seems that even though this variable hadn't been created at the time the toolbox function "fit" was being called, the error was still occuring during the function call, rather than later when the variable "fit" was being created. It took me a while to catch this, bc the variable "fit" was being created much later in an unrelated part of the function that I don't ever look at, and the error message had me considering installation/path issues.

[John D'Errico]

Sorry that it was so hard to track down. Always avoid using names that are also function names. This gets to be a habit you need to follow religiously. When you create a variable, make sure it is not the same as a function you will be using, or even ever possibly use.

For example, in my case, I am always careful to never use variables with the name alpha, beta, gamma. This even though, as a mathematician, they would be variable names I'd use normally withought a thought. I just make it a habit to be careful about variable names. If I desperately wanted to name a variable fit, I might prefer phit instead.