Walter Roberson

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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.

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I am trying to input an equation with multiple integrals and infinite summations.
integral() is only for numeric integrals. For symbolic integrals you need int()

約19時間前 | 0

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Error using sum Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'.
sum(ATretreive{1,7:10}) ATretrieve is a cell . Using index {1,7:10} is cell expansion, and is going to produce a comma-separate...

約22時間前 | 0

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How to define the 3D output file name and its characteristics in MATLAB
title('Woven Unit Cell') ; box on Except the command is setting options for surf() and plot3() and scatter3() and patch(...

1日前 | 0

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How can I remove if statement ?
if d == 2 || d == 4 || d == 6 repeats = d/2; t = repmat({temp}, 1, repeats ); A(:,:,1,1) = blkdiag(t{:}); ...

1日前 | 0

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How can I solve this problem "Invalid or deleted object." Is hold 'on' missing somewhere?
h_f1_plot1 = plot(1,1); h_f1_plot2 = plot(1,1); Those are on the same axes, the one you activated with h_f1_ax6 = ...

1日前 | 0

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Substituting a variable in an equation
eqn1 = subs(eqn1, str2sym('x+y'), pi/2); eqn2 = subs(eqn2, str2sym('x+y'), pi/2); The reason for this is that at the point you...

1日前 | 0

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writetable - wrong number of arguments
The following code will atempt to debug why your file cannot be written to. In its current form, it is specific to MS WIndows (j...

1日前 | 0

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connect NI-USRP 2901 with MATLAB
The details have changed since I last answered the same question, but the answer is still correct. https://www.mathworks.com/ma...

1日前 | 0

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Dynamic call to structure elements
for K = 1 : 3 MyStruct.(sprintf('Elmt%d', K)) end or for K = 1 : 3 MyStruct.("Elmt"+K) %rely on string obje...

1日前 | 0

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Unrecognized method, property, or field 'Position' for class 'matlab.graphics.GraphicsPlaceholder'.
Your findobj() is not locating any PolarAxes, and is returning the empty GraphicsPlaceholder object. When you ask to access a f...

1日前 | 0

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How to extract data from on a timetable dependent on a date range
https://www.mathworks.com/help/matlab/ref/timerange.html However, I would suggest that you might not be asking the best questi...

1日前 | 0

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how to use for loop along with ode45 to generate a series of plots
for N = 1 : 10 za = fzero(@(za) res(za,N), 50) [x, T] = ode45(@(x,T)func(x,T,N), [0.3 1], [0; za]); plot(x, T(:, ...

1日前 | 0

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What does "IND" do?
There is no "ind" function in that code. What the code is doing is adding values to the end of a list. If Blt(1) is 1, then ad...

1日前 | 1

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Code initiates again after exiting while loop which is within an if statement
I gave a detailed explanation of how for loops work in https://www.mathworks.com/matlabcentral/answers/356884-how-do-i-convert-t...

1日前 | 0

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Comparing different size of Matrix Problem
In some cases it might make sense to use Dynamic Time Warping to compare the vectors; see https://www.mathworks.com/help/signal/...

1日前 | 0

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diff command in matlab
Q0 = diff(diff(L,diff(t1))) - diff(L,t1); diff(t1) will generally be an expression, seldom happening to be a scalar variable. Y...

1日前 | 0

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How to became my Tridiagonal matrix
full(spdiags(B',0:-1:-3,7,4))

1日前 | 0

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Help with efficient way of importing data file with specific structure
filename = 'appropriate_name'; fid = fopen(filename); nvars = fscanf(fid, '%f', 1); tdata = textscan(fid, '%[^\n]\n', nvars...

1日前 | 1

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parfor variable cannot be classified
https://www.mathworks.com/help/parallel-computing/troubleshoot-variables-in-parfor-loops.html Sliced variables: https://www.m...

1日前 | 0

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Home License Limitations and Service Maintenance renewal cost
i expect "perpetual" access to the add ons that I have paid for as well as the one available to Matlab users for free but now th...

1日前 | 2

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besself does not plot correctly
You use freqs(bn, an, 1e6) . That asks it to pick out 10^6 frequencies, but it does not say anything about the range to pick the...

2日前 | 0

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Will MATLAB Live editor ever support spellcheck?
"Will MATLAB Live editor ever support spellcheck?" You should assume that the answer to *all* questions about whether MATLAB ...

2日前 | 1

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How can I copy figure to UIAxes?
Use imhandles() on the figure that is showing the gramm object. You can now copyobj() the resulting handle(s) to a uiaxes that...

3日前 | 0

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convert csv file and write to another .m file
filename = '100Cr6.csv'; S = fileread(filename); S = regexprep(S, {',', ';'}, {'.', ','}); mdata = cell2mat( textscan(S, '', ...

3日前 | 0

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hello everyone, i have this urgent problem
I discus one of the techniques in https://www.mathworks.com/matlabcentral/answers/496730-how-to-start-and-stop-parallel-timer-de...

3日前 | 0

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Error using matlab.ui.control.internal.model.AbstractNumericComponent/set.Value (line 111) 'Value' must be a double scalar.
app.EditField.Value = double(x3) ;

3日前 | 0

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Is there any discrete mathematics solver for symbolic equations ?
you will need to use evalin or feval into the symbolic engine, and use rec() to build the recurrence equation and then solve() t...

4日前 | 0

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Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
[bestpar, resnorm, residual, exitflag, output, lmd, jacobian] == lsqnonlin (@ fz_costo_sana, startpar [0.01 0.01; .01] [10 10 ...

4日前 | 0

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Keeping command line programs open while inputting and outputting text files
You should be using .Net processes https://blogs.mathworks.com/loren/2010/12/07/using-microsoft-net-to-expand-matlab-capabili...

4日前 | 0

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run .exe file with matlab in unix
exe files are Windows executables that are not directly usable in Unix. If you have a windows emulator such as wine you might...

5日前 | 0