Walter Roberson

Last seen: Today | Actif depuis 2011

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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
Spoken Languages:
English

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I need the installer for Matlab R2010b SP1
Visit https://www.mathworks.com/downloads/ In the top left, use the Select Release dropbox to select R2010bSP1 . That will tak...

environ 15 heures il y a | 0

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Unable to plot the two for loops together.
The two functions differ by 40 at every location. 40 is much less than the value of the function, which goes up to 5 x 10^10. A...

environ 16 heures il y a | 0

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How to find the distance between two points along a curve?
Use https://www.mathworks.com/matlabcentral/fileexchange/34871-arclength

environ 20 heures il y a | 0

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How to create variable length buffer in Simulink for holding the value with unknown dimensions ?
You are going to have trouble with that approach unless you use dynamic memory allocation. Better is to set a maximum length be...

environ 20 heures il y a | 0

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How to write the sum of several matrices in Matlab ?
syms c N num_i = 3; %adjust as needed num_j = 4; %adjust as needed num_n = 10; syms x [num_i 1] syms y [1 num_j...

environ 20 heures il y a | 0

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what am i doing wrong?
size(a(:,i)) is a vector of length 2. You should use size(a,1)

environ 21 heures il y a | 0

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Error Using horzcat in MATLAB
parityMatrix = [1 1 1 0 1 0 0; 1 1 0 1 0 1 0; 1 0 1 1 0 0 1]; parityMatrix is 3 x 7 generatorMatrix = [eye(4) parityMatrix']; ...

1 jour il y a | 0

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Why do I get an error using estimate for an msVAR model?
By default, Y0 is the initial portion of Y (which is your Data). If your Y (Data) is sufficiently small, then Y0 might potenti...

1 jour il y a | 0

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Error trying to start Simulink from m-file.
It sounds as if the block diagram 'Gelenkmodell' is configured with an InitFcn that invokes Reibkennlinie_festlegen but that Re...

2 jours il y a | 0

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Please assist to resolve "magaa and mag2a" codes problems; probably FUN and fsolve, not properly sets. The mag2 has to generate 12 (Qy-variable) questions by for-end. Thanks
function [Qy, FUN] = MAGa(Qy0) tic, n=12; pipes=n; dia=n; LP=4; cCc=7; HLD=-0; ee=0.04; vs=1.00001*10^-6; ...

2 jours il y a | 0

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I keep getting a “cannot convert double value “…” to a handle. Does anybody know how I can fix my code in order for this to go away
Historically, up to R2014a, it was the case that graphics handles were returned as double precision numbers. This allowed constr...

2 jours il y a | 0

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How to use integral when limits are anonymous functions
Your problem is unsolvable (in the form stated) You cannot use integral() with symbolic limits: integral() is strictly a numeri...

3 jours il y a | 0

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Are Windows machine for desktop real time and speedgoat using simulink real time uses same kind of processors aechitecture?
Speedgoat runs on Intel x64 class of processors, it appears to me. For different systems, I see reference to Atom processors or ...

3 jours il y a | 0

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How to save a figure as a geotiff
geotiffwrite from the Mapping Toolbox But I don't know what it means to save an "entire" surface, as distinct from the points t...

3 jours il y a | 0

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Why are some of my functions 'Undefined' in my standalone executable compiled from MATLAB source and pcode files?
In https://www.mathworks.com/matlabcentral/answers/1579108-how-do-i-use-and-s-flag-for-compiling-a-matlab-app#comment_2779289 ...

3 jours il y a | 0

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Loading hex values from a file vs executing .m file that contains same values
It's a bug. It is processing all d and D as if they were e

4 jours il y a | 0

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How do I set a read-only class to a specific value
No, there is not. And if there was a way, setting the NumBytesAvailable would confuse the system because it would either lose tr...

4 jours il y a | 0

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Why I am not able to open openExample('simscapefluids/ElectricVehicleThermalManagementExample') ?
If you are using an older version of MATLAB, you might need to use sscfluids_ev_thermal_management The example was renamed in ...

4 jours il y a | 0

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HDL Coder Error: HDL code generation does not support variable-size matrix type.
temp_slice(1:16-b+1) = temp(b:16,b); % You do not declare temp_slice before use, so you are growing it within a loop, which...

4 jours il y a | 0

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running matlab exe file results in "Too many input arguments. MATLAB:TooManyInputs error"
You need function main_file(varargin) When you compile an executable, command line arguments are passed as parameters to the m...

5 jours il y a | 1

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Excel headers with symbols
You have to either code the symbols as character constants or else code the unicode to create the symbols. C = [Tag + "_" + L...

5 jours il y a | 0

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How do I use my data set in an equation?
lb = mean(lm,1); formula = log(lb./lm);

5 jours il y a | 0

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Received this error, not sure how to fix
M=1:2:11; N=1:2:11; those are length 6 for i=1:length(M) for j=1:length(N) for mi=1:i for ni=1+j ...

5 jours il y a | 0

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Create contour plot from scatter plot
See https://www.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data

5 jours il y a | 0

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Can function [s,h] = silhouette(X, clust, distance, varargin) be run using parfor (parallel computation)?
Sorry, you cannot accelerate it using parallel computation.

5 jours il y a | 0

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error in concatenating cells
ft_epoch = cell2mat(reshape(ftData728178E.trial, 1, 1, [])); However, if what you are already doing creates NaN then it means...

6 jours il y a | 0

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What does it mean "/Multiple" after variable name in *.mat file?
The .mat file has been created by an external program not using the official Application Programming Interface. The variable nam...

6 jours il y a | 0

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Support for NVIDIA RTX A1000
The RTX A1000 has compute capacity 8.6 according to several sites I check. As such, the Parallel Computing Toolbox should be ab...

6 jours il y a | 0

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Error in AWGN Using Integers or scalar doubles
lenna = imread('lenna.png'); the result is almost certainly a uint8 matrix. lenna_gray = rgb2gray(lenna); rgb2gray() of a uin...

6 jours il y a | 0

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how to convert text file as it was written .m file to call functions?
SS = fileread(NAME_OF_FILE); eval(SS)

6 jours il y a | 0

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