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Walter Roberson


Last seen: Today Active 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
Getting updates from fsolve
https://www.mathworks.com/help/optim/ug/fsolve.html#buta__s-options set the Display option to iter

alrededor de 5 horas ago | 1

| accepted

Answered
Matlab and 'sandbox' process Peak CPU Usage in macOS Big Sur
This is a known issue in Big Sur 11.4 for M1. I notice that you are not using M1; it is plausible that the same underlying prob...

alrededor de 6 horas ago | 0

Answered
Multivariate nonlinear equation generation
No, it is not possible in the form stated. Given any finite number of points expressed in finite precision, then there are an u...

alrededor de 6 horas ago | 0

Answered
could anyone help me to solve the issue in the following command
B = arrayfun(@(N) randi(2,1,N), repelem((1:3).',5), 'uniform', 0)

alrededor de 6 horas ago | 0

Answered
Finding closed form value of a variable
That is the closed form. You could approximate it using double() or vpa()

alrededor de 7 horas ago | 0

Answered
How to set the boundary value of the integral function as a variable
format long g f = @(x)sqrt(3600-x^2)-10 t = (-70:70).'; syms x T F = int(f(x), x, T-10, T+10) val = [t, double(subs(F, T, t...

alrededor de 14 horas ago | 0

| accepted

Answered
How to solve 3 simultaneous algebraic equations with a equality constraint.
You cannot usefully plot x1 vs t. Your system defines three specific sets of points, two of which are complex-valued syms x1 x2...

alrededor de 14 horas ago | 0

| accepted

Answered
How to get the coordinate of cropped rectangular image?
I have manually cropped the area in image 1 Then I predict that the issue is that you do not know what coordinates you manually...

alrededor de 14 horas ago | 0

Answered
could to create the categorical values for 2x2 cell array
B = cellfun(@convert_to_categorical, A, 'uniform', 0); function C = convert_to_categorical(M) if iscell(M) C = cel...

alrededor de 15 horas ago | 0

Answered
how do I add MATLAB prompt to command window?
You will not get the >> prompt if MATLAB is busy, or if MATLAB is waiting for you to finish a statement (such as if you are in t...

alrededor de 15 horas ago | 0

Answered
Why the energy value is constant?
x cancels out. radius involves x^(1/5) Your energy calculation has radius*radius*thickness*radius*radius. thickness = radius...

alrededor de 15 horas ago | 0

Answered
how to simplify the command line that generates cell array
No, there is no simplified way to write it. You can automate it in some ways, but the automated versions are more complex. C = ...

alrededor de 15 horas ago | 0

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Answered
Change MaxFunctionEvaluations in optimization problem
options = optimoptions(prob,'Algorithm','interior-point','MaxFunEvals',10000); [sol,fval,exitflag,output] = solve(prob, x0, 'Op...

alrededor de 15 horas ago | 0

Answered
how to convert cell to double inside cell array
mask = cellfun(@iscell, A); A(mask) = cellfun(@cell2mat, A(mask), 'uniform', 0);

alrededor de 15 horas ago | 0

Answered
Why is fitglm throwing subscripting error with hospital dataset?
That problem does not occur for me if I test in R2020b (your version) or R2021a When I look at the code, I can see that the pro...

alrededor de 16 horas ago | 0

| accepted

Answered
looping for a function
This has nothing to do with a missing function. Your code in drought.m is defined to expect at least four output variables -- ...

alrededor de 16 horas ago | 0

Answered
Sending values using slider in MATLAB GUI to Arduino using serial communication
fwrite(handles.ser1,valor,'double'); That transmits the binary value of valor as an IEEE 754 double precision integer. 64 bits ...

alrededor de 17 horas ago | 0

| accepted

Answered
'm quite frustrated about where I went wrong can you please lend some help. I promise I tried
Your g is the value that is expected to be in F. Do not use poly(g) to create F: that creates a polynomial whose roots would be ...

alrededor de 17 horas ago | 0

Answered
Sending values using slider in MATLAB GUI to Arduino using serial communication
That code is okay in itself. You do not need the guidata() call as you are not changing any fields of the structure handles, bu...

alrededor de 17 horas ago | 0

Answered
how can i fix subscript indices must be either real positive integers or logicals
At a location approximately half way through the third line, you have (x(60^3*(x(1) - x(2)))/6 You might possibly have intende...

alrededor de 17 horas ago | 0

| accepted

Answered
How to extract the features of each cluster in the k means clustering?
No. There are an uncountable infinity of possible "features" for any given set of points, even if the set of points is a finite ...

alrededor de 18 horas ago | 0

Answered
how to save values for changing number of columns using "for loop "
We do not know the size of U. Call it N x M U(:,1:r) is an N x r matrix U(:,1:r)' is an r x N matrix. X we do not know the si...

alrededor de 18 horas ago | 1

Answered
Dot indexing is not supported for variables of this type.
cell_array_of_folder_names2 = setdiff({sad22([sad22.isdir]).name},{'..','.'}); % Select folder names Those are file names Fil...

alrededor de 24 horas ago | 0

Answered
Problem with patch function
It is not clear what result you would expect when the data overlaps and one of them has a "twist" ? load('XZ.mat') fill(X(1,:)...

1 día ago | 0

Answered
datetime unable to parse format 'mmm dd, yyyy'
datestr() uses 'm' to indicate months, but datetime() uses 'm' to indicate minutes. You cannot use the same format string for bo...

1 día ago | 0

Answered
how to plot different cell arrays in just one graphic?
temp = [reshape(First, 1, []); reshape(Second, 1,[])]; plot(temp{:})

1 día ago | 0

Answered
Why do i receive "Error using plot. Data cannot have more than 2 dimensions"
You have variables with three indices. plot() is a tool for 2d line plots,and cannot handle 3d arrays. When you have 3d arra...

1 día ago | 0

Answered
How to implement the math equation correctly to make a plot ?
%rectangular aperture array factor. N = 150; I_0 = 1; lambda =1.55e-6; k=(2*pi)/lambda; period = 2e-6; theta = linsp...

1 día ago | 1

| accepted

Answered
Can't get data from input string
if ~isfield(data, 'name') error('dataset "%s" is not loaded', name) end pos = data.(name);

1 día ago | 0

Answered
Change corners from image
img = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/661015/image.png'); imshow(img); title('original ...

1 día ago | 0

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