Walter Roberson

Last seen: Today | Con actividad desde 2011

I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location. I am currently caught up to T0099119; if you are waiting on a reply from me for an older issue, please send me a reminder.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
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FFT error 'not supported to carry out script fft as a function'
you named your file fft.m which makes it impossible to call the Mathworks fft function. You need to rename your fft.m

alrededor de 2 horas hace | 0

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How to use matlab to achieve multiple cycles, as shown in Figure 1
ivals = 1:3; jvals = 1:3; numi = numel(ivals) ; for idx = 1:numi i = ivals(idx) ; j = jvals(idx) ; dis...

alrededor de 3 horas hace | 0

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Is my code correct?
You should rarely plot an image. plot() is for creating line plots. Your code will produce plots with one line for each column ...

alrededor de 6 horas hace | 0

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How to store data in multiple matrix from table
if thrustslope >= abs(0.2) It is possible that is never true. elseif thrustslope == 0 It is possible that is happening very e...

alrededor de 6 horas hace | 0

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Can someone check my code, I am unsure if it is correct.
Your x is uniform increase. Its gradient is constant -- every entry is a fixed value greater than the one before. You are plott...

alrededor de 7 horas hace | 0

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How can I properly change a row in my matrix table in excel into letters?
Sx = categorical({'Male', 'Female'}); nexcel.('Height (cm)') = Sx(nexcel.('Height (cm)')); I think people are going to find it...

alrededor de 8 horas hace | 0

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Cone Detection Issues Question
If the purpose is to detect traffic cones, then you must train your detector on a set of images, some of which include cones and...

alrededor de 8 horas hace | 0

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Is my code wrong because why am i getting this output? Use the MATLAB command conv2() to convolve image3 with itself. What is this process referred to as? Show the result.
The image you posted is an RGB image, not a grayscale image. You cannot use conv2() with it, not unless you select out a single ...

alrededor de 8 horas hace | 0

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Can someone explain this code please? This was my question: Add the pixels of image1 to image2 in order to create a new image using for loops.
[r,c,n] = size(img1) assigns the number of rows in img1 to r, the number of columns in img1 to c, and n is assigned the product...

alrededor de 8 horas hace | 1

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How can I get the numbers from GUI edit text in the contex like (1,2,3) ?
S = strtrim(get(handles.initial_point,'String')); nums = str2double(regexp(S, '[\s,]+', 'split')) This allows spaces and/or co...

alrededor de 9 horas hace | 0

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surface plotting.surface plot poroblem. Please I want help. An error appears when running
w = 1; k=1; figure tspan = linspace(0, 5); %must be a vector of length 3 or more zvals = 0.1:0.01:0.5; numt = length(tspa...

alrededor de 9 horas hace | 0

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Open .fig files for editing without having MatLab
The interactive edit tools such as Property Inspector are not available in compiled executables. You could write your own code...

alrededor de 10 horas hace | 0

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Terminal works but cant use scripts or functions
I suspect you are being hit by the Linux-related tmpfs bug. See https://www.mathworks.com/support/bugreports/2856360

alrededor de 11 horas hace | 0

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How Do I Get My Script To Work For Just One Figure Window? Currently It Loads Into Two
You are using shared variables that are being examined or set within callbacks set on the graphics objects. Now, when you creat...

alrededor de 11 horas hace | 0

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Command, replacing data points at given field indices with the average of the values before and after
What if you assign nan at those locations, and then use fillmissing ?

alrededor de 11 horas hace | 0

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using trapz in a for loop
int=trapz(s(1:i),ue(1:i)); when i is 1, that would be trapz(scalar,scalar) . But when you trapz() and the second parameter is ...

alrededor de 11 horas hace | 0

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Adding Noise To An ECG Signal
signal = load ('ecgsignals.txt'); plot(signal); xlabel('Samples'); ylabel('Electrical Activity'); title('ECG Signal Values i...

alrededor de 12 horas hace | 0

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Why my plot in MATLAB LiveEditor is mirrored both on horizontal and vertical axes?
https://www.mathworks.com/help/matlab/views.html Your camera view might not be what you expect, or perhaps the camera looks d...

alrededor de 20 horas hace | 0

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install_unix_legacy not found On Ubuntu Arm64
MATLAB is not supported on any ARM processors for Linux. There is a beta version for ARM support for Apple M* series.

alrededor de 20 horas hace | 0

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getting alot of exceeding memory errors and errors such as array exceeding maximum allowed size in my code
record audio returns *rows* of data. Your sine wave is *columns*

alrededor de 20 horas hace | 1

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How can I access char elements from the beginning up to some fixed index of the char?
a(1:6)

alrededor de 20 horas hace | 0

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How to find increasing data points in an array?
A=[2 1 4 2 6 7 8 10 12 14 16 18 20 22 24 12 10 9 11 8 ] diffA = diff(A) start = find(diffA > 0,1); Now start might be empty (...

alrededor de 24 horas hace | 0

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i have excel sheet 31 coulmn,, the first coulmn is time and in the other coulmns the signals names , what i need from the code is that at spefic time to tell me for examplk
Given a particular scalar row index (calculated from the time, perhaps): VarNames = YourTable.Properties.VariableNames; Valu...

1 día hace | 0

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How to delete all Files not listed in "FileName" variable?
Use arrayfun(@delete, F)

1 día hace | 0

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error because "pkg load symbolic"
That code is not MATLAB code; it is Octave code. For MATLAB comment out pkg load symbolic Note: Fww0=round(eval(Fw(w0))*1000)...

1 día hace | 0

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Issue using fmincon, using code not written by my group and updating it to work now
For debugging, call aerospike_main(x0, at, pinf, p0, gamma, numsteps) and examine the results. See if there is an error messag...

1 día hace | 0

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How to store intermediate values of solution in ode45
Doing that would be a mistake. Runge-Kutta methods such as ode45 always have a "current" state, and a current step size. They e...

1 día hace | 0

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Printing special characters in an axis label
Temp = -19.6 ylabel(sprintf('T at %.0f \\circF',Temp), 'Interpreter', 'tex')

1 día hace | 0

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How to set the result output format of the matlab software to be the same as that in the webpage?
You cannot do that. The format you see on web pages is only available if you use LiveScript, and is not available from the comm...

1 día hace | 0

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drawing a point in the graph
x = 0:0.5:10; t = (x/2).^2; abs(x-2*sqrt(t)) %cross-check weether x == 2*sqrt(t) plot(x, t, '*-')

1 día hace | 0

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