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Walter Roberson


Last seen: Today
50.564 total contributions since 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.

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Answered
Galois field to binary matrix conversion (BCH encoding)
NC = noisycode.x; That will be uint32 with min 0 and max 0, so you can logical() it or double() it or uint8() it as appropriate...

alrededor de 3 horas ago | 0

Answered
How to add constraints to simulannealbnd minimization
You cannot add constraints directly. However you can set AnnealingFcn to the handle of a function that only generates points tha...

alrededor de 3 horas ago | 1

Answered
Plotting a non linear equation.
format long g t_min = .3, t_max = .8 syms theta_opt m real a = sin(theta_opt).^2; b = (cos(theta_opt) - sin(theta_opt)...

alrededor de 4 horas ago | 1

| accepted

Answered
Input #2 expected to be a cell array, was struct instead.
You need arrayfun() instead of cellfun() for that purpose. This assumes that in time Code2Model will be a non-scalar struct ar...

alrededor de 4 horas ago | 0

Answered
How to get all possible combinations of three independent data sets?
A = [A_x A_y]; B = [B_x B_y]; C = [C_x C_y]; ABC = [A;B;C]; D= [D_x D_y]; E = [E_x E_y]; F = [F_x F_y]; DEF = [D;E;F]...

alrededor de 4 horas ago | 2

| accepted

Answered
guesses of parameters in fmincon do not satisfy the constraints in nonlcon
Solvers can violate bounds constraints with some options: https://www.mathworks.com/help/optim/ug/iterations-can-violate-constr...

alrededor de 4 horas ago | 0

Answered
Find the index range of ones/trues?
test_vector = [0,0,1,0,0,1,1,0,1,1,1,0,1,1,1,1]; starts = strfind([0 test_vector], [0 1]); stops = strfind([test_vector 0], [1...

alrededor de 4 horas ago | 0

Answered
Improving speed of readtable
Where all of the time is spent on the TreatAsEmpty command (because of having many zero entries?) No, that is not what is happe...

alrededor de 5 horas ago | 0

| accepted

Answered
Device number can that used with one license
Home and Student licenses: one device only (Individual) Academic licenses: two devices activated (Individual) Standard (Commer...

alrededor de 8 horas ago | 0

Answered
Fzero function error in matlab
x = fzero(@(x) (707.34/(x-x^2)*(1+0.1*(10.589*(1-x)/x).^0.75)-(x-x^2)*9778.608 , 0.2) 1 2 1 2 3 2 3 4 ...

1 día ago | 0

Answered
How do I find unknown parameter from an equation?
eqn = @(c) z - a.*b./(c.*d); c = fsolve(eqn, GUESS) This assumes that the equation is complex enough that you cannot just me...

1 día ago | 0

| accepted

Answered
Issues with audiorecorder function in Matlab online R2020a?
As mentioned by @Eddy Armas At least up to R2021a, MATLAB Online does not support audio input. MATLAB Online does support som...

1 día ago | 0

Answered
When combining multiple photos, I want to have one matrix that shows only the highest value at each pixel's place.
Start with the first image, and copy it to the proposed output. For each additional image, figure out how it overlaps the curre...

1 día ago | 0

Answered
How to increase matlabFunction length limit
matlabFunction(C, 'vars', {q, qdot, alpha, l, rho}, 'file', strcat(dpath,'/C_fun'), 'Optimize', true); Index exceeds the number...

1 día ago | 0

Answered
How to make multiple execution of a code by loop ?
Replace x=array2table(x) y=array2table(y) TABLE=[A B x y]; TABLE.Properties.VariableNames(1:4) = {'A','B','x','y'}; with ...

1 día ago | 0

Answered
How can I covert serious of grey scale images to jet images
in_ext = '.png'; out_ext = '.png'; projectdir = 'path/to/files'; %can be '.' outdir = 'path/to/store/output'; %must be dif...

1 día ago | 0

Answered
how to speed up code
If I read the code correctly, then numused = sum(track_length_DNS); mycell_tracks_index = mat2cell(index_tracks_matching(1:num...

1 día ago | 0

| accepted

Answered
Reading a .dt2 file in MATLAB
https://www.mathworks.com/matlabcentral/fileexchange/25897-read-dted-elevation-data looks like it should support .dt2 files.

1 día ago | 0

Answered
Can you use matlab code within an Arduino sketch?
MATLAB code cannot be included in an arduino sketch. With current releases, you can target MATLAB code to be deployed to Raspb...

1 día ago | 0

Answered
FSOLVE requires all values returned by functions to be of data type double.
syms a b c d e X=input('numb of carbon atoms in fuel'); Y=input('numb of hidrogen atoms in fuel'); Z=input('fuel to air ratio...

1 día ago | 0

Answered
How to break a while loop to another one?
while outer test outer stuff quit_middle = false; while middle test middle stuff while inner test i...

1 día ago | 0

Answered
Exporting the output into a .txt file
You could evalc() the code, getting back a character vector, that you then wrote to a file. You could fopen() a file, and fpri...

1 día ago | 0

Question


Identify Simulink blocks by shape and ports?
Is there a facility to help people figure out what block shapes are which Simulink / Simscape blocks? I see people posting Simu...

2 días ago | 0 answers | 0

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answers

Answered
I'm having problems copying a 4-D array
https://www.mathworks.com/help/releases/R2017a/matlab/ref/imread.html?searchHighlight=imread&s_tid=doc_srchtitle#inputarg_idx T...

2 días ago | 1

Answered
How can I best receive data from a web hook into Matlab?
The URL for the webhook could be connected to a webserver on your host that accepted the request (such as with PHP or ASP), cons...

2 días ago | 0

| accepted

Answered
How to deal with table
Removing entries that have empty exData: mask = cellfun(@isempty, newT.exData); newT(mask,:) = []; If I understand correctly,...

2 días ago | 0

| accepted

Answered
While loop for sum
n = 1; while true do something n = n + 1; if n > N; break; end end or n = 0; while true n = n + 1; if n > ...

2 días ago | 0

| accepted

Answered
fixed points in the plots
syms A B G A, B, and G are created as scalar symbols f = matlabFunction(sum1m2, 'vars', [A, B, G]); g = matlabFunction(sum3...

3 días ago | 0

Answered
reset button gui matlab
cla RESET deletes all objects (including ones with hidden handles) and also resets all axes properties, except Position...

3 días ago | 0

Answered
Issue with lsqnonlin function solve
fix_values is a column. You subtract something from it (suppose it is a column as well), getting a column. Then you try to ^2 th...

3 días ago | 0

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