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Xingwang Yong


Last seen: 3 días hace Con actividad desde 2019

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Respondida
Section color no longer an option in 2021b?
Improved appearance? The default color scheme in R2022a is already a mess. Not to mention the missing section highlight, which c...

3 días hace | 2

Respondida
close a message box thru coding
m = findall(0,'type','figure','tag','Msgbox_ '); delete(m);

3 meses hace | 1

Pregunta


Figure zoom-in by mouse scroll is disabled after ROI is drawn
figure;imshow(imread('pout.tif')); Normally, I can use mouse scroll to zoom-in and zoom-out. But, if I draw ROI, imrect(); Th...

4 meses hace | 0 respuestas | 0

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respuestas

Pregunta


How to create ROI object handle?
h = figure; imshow(imread('pout.tif')); imrect(); hg = findobj(h,'Type','hggroup') % How can I "create" a ROI object so th...

4 meses hace | 3 respuestas | 0

3

respuestas

Pregunta


Codegen failed to infer output size of built-in function, ??? Dimension 1 is fixed on the left-hand side but varies on the right ([1 x :?] ~= [:? x :?])
I tried to codegen a large file containing downsample(), below is a simplified one. For some reason, I have to specify the outpu...

5 meses hace | 1 respuesta | 0

1

respuesta

Enviada


estimate_blur
Estimate blur of an image

8 meses hace | 3 descargas |

Respondida
Skip commas inside brackets when the expression has operators
expr1 = '(?<=\([^)]*),(?=.*\))'; % comma inside parenthesis, like '(..., ...)' index_comma_in_paren = regexp(line, expr1); On...

10 meses hace | 0

Pregunta


Numerical precision when using colon operator
I am doing simulation, which basically is iteration over time. Given the delta time dt and total time inter_pulse_space*num_puls...

10 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


Zoom in using mouse scroll during uiwait sometimes fails
I want to zoom in a figure (with mouse scroll) during uiwait, however this did not always work. If you directly run main.m, y...

alrededor de 1 año hace | 1 respuesta | 0

1

respuesta

Pregunta


When drawpolygon(), how to programtically delete a series of vertices?
I want to refine the automatically generated mask (denoted as init_mask below). I set corresponding points in drawpolygon(). ...

alrededor de 1 año hace | 0 respuestas | 0

0

respuestas

Pregunta


Why would command syntax split string when using double quotes?
disp 'str ing' % good disp "str ing" % error, Too many input arguments I am on R2020a. It seems that the latter is equivalent ...

más de 1 año hace | 1 respuesta | 0

1

respuesta

Respondida
How do I write a loop in MATLAB that continues until the user presses any key?
A version uses nested function instead of global variable function myLoopingFcn2() KEY_IS_PRESSED = 0; gcf set(gcf, 'Ke...

más de 1 año hace | 0

Pregunta


Overlay image, code as function and code as script give differnt results
I want to overlay a colored image onto a gray image, and I found a solution here. If I run it as a script, it works perfectly. H...

más de 1 año hace | 2 respuestas | 0

2

respuestas

Pregunta


Colormap Editor, a "fixed" bug leads to other bugs?
In R2020a on windows 10, if you adjusted the system scaling factor, e.g. to 125%, then every time you open Colormap Editor, it w...

más de 1 año hace | 0 respuestas | 1

0

respuestas

Pregunta


Under what circumstance, mex-version of lsqcurvefit run slower than m-code of lsqcurvefit?
I converted a function to mex using Coder, which contains lsqcurvefit() to get some speedup. But this mex-version is slower than...

casi 2 años hace | 0 respuestas | 0

0

respuestas

Pregunta


Use coder to convert parfor-loop to mex, but mex version is much slower
I convert a function containing a parfor-loop into a mex file to get some speed up. But the mex version of this function is 5x t...

casi 2 años hace | 0 respuestas | 0

0

respuestas

Pregunta


Will codegen accelerate sub-functions?
I have functions look like % main.m function main() for i fun1(); end % fun1.m function fun1() for j fun2() ...

casi 2 años hace | 1 respuesta | 0

1

respuesta

Respondida
Handling bound constraints by the Levenberg-Marquardt algorithm
In matlab2020b, the doc of lsqcurvefit() has removed "The Levenberg-Marquardt algorithm does not handle bound constraints". So ...

casi 2 años hace | 0

Respondida
What is the alternate to eval function in a forloop?
Using cell array should help for i for j for k I{i,j,k}=getsiganl(filename1); II{i,j,...

casi 2 años hace | 0

Respondida
How to get Data type of workspace loaded variables and how add that datatypes using script?
s=whos; numBytes = sum([s.bytes]);

casi 2 años hace | 1

Respondida
Save and load variables of different samples
You could try cell(). You do not have to save the variable names. c = cell(1,1); % each col contains variables of a sample, eac...

casi 2 años hace | 0

Pregunta


codegen can't build the simplest demo
I am using codegen to build the 1st example in its doc, i.e. mcadd.m, it did not work. I am running Maltab2020a on CentOs 8.3. ...

casi 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Call mex function using system()?
I downloaded a toolbox, which contains a pre-compiled mex file, foo.mexa64. The calling syntax is a little bit confusing, but ...

casi 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


How to customize callback after drag and drop a folder into command window?
For files, it is easy to customize a callback after drag and drop file into command window, as shown here. However, for folders...

alrededor de 2 años hace | 0 respuestas | 0

0

respuestas

Pregunta


Using Matlab coder with lsqcurvefit(), can not pass optimoptions as an argument to the target function
I want to convert my function to mex using matlab coder. The function fits data to an exponential model. function ab_fitted = m...

alrededor de 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


How does vectorized lsqcurvefit() calculate sum-of-square, row-wise or column-wise?
I have a 1001 measuments, in each measurement, there is a curve y = a*exp(-b*x) where x and y are vectors containing 8 element...

alrededor de 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


In parfor-loop, can I call a multi-threaded mex and get some speed-up?
I learned the concept of multi-threaded mex from undocumentedmatlab. (It seems this website is unaccessible now ...) I am wonde...

alrededor de 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Mex, how to copy an array to output
In my mex function my_expm.c, I calculated matrix expoential for the input matrix, void mexFunction(int nlhs,mxArray *plhs[], i...

alrededor de 2 años hace | 1 respuesta | 0

1

respuesta

Pregunta


With mxMalloc() and mxSetDoubles(), mex function crash matlab
I try to build a mex interface for a C function r8mat_expm1() that calculates matrix exponential, double *r8mat_expm1 ( int n, ...

alrededor de 2 años hace | 3 respuestas | 1

3

respuestas

Pregunta


Mex, how to make visual studio support C11 standard?
I am building a mex function from c language, which uses a non-standard data type, i.e. double complex, double complex *my_f...

alrededor de 2 años hace | 1 respuesta | 0

1

respuesta

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