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Walter Roberson


44,344 2011 年以降の合計貢献数

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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Trying to solve a system of equations with 14 equations and 14 unknowns
pmp_spd=@(D) Vfr*(Vfr_dim * D^3); That creates a function handle. The only things you can do with a function handle are: displ...

約5時間 前 | 0

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How to apply pca to audio files (pitch features)?
path_to_directory= dir ('**/*.wav'); % path to the directory for i = 1:length(path_to_directory) filename = fullfile(path...

約6時間 前 | 0

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Solving a cubic function to get one numeric result?
S = solve(eqn,V,'Real',true,'MaxDegree',3) and sols = solve(a*x^3 - b*x^2 + c*x - d, x, 'MaxDegree', 3) and p = [1 -0.109331...

約6時間 前 | 0

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Ways of finding Jacobian
https://www.mathworks.com/matlabcentral/answers/407316-how-can-i-take-the-jacobian-of-a-function#answer_326202

約7時間 前 | 0

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Error in for Loop to upload data from multiple CSV Files
You have accidentally created a variable named fullfile

約8時間 前 | 0

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How can I change the lamp color while the application is running?
Use drawnow() to give MATLAB a chance to update the screen.

約20時間 前 | 0

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Code running, but not being displayed in command window?
You have function F=q4(x) % System of non-linear equations F(1) = x(1)^2+x(2)^2-26; F(2) = 3*x(1)^2+25*x(2)^2-100; %part b ...

約20時間 前 | 0

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work with numbers in number
x = 40.201109; xs = sprintf('%.6f', x); a = str2double(xs(1:2)); b = str2double(xs(end-3:end-1)); c = str2double(xs(end-2:en...

約20時間 前 | 0

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Error using ones Size inputs must be integers?
If you want an image the same size as img2 then r = zeros(size(img2), class(img2)); after which you can assign ones into an ap...

約21時間 前 | 0

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Display real time data in GUI.
Variables are only global inside of functions that declare them to be global. You can never force a variable to be global everyw...

1日 前 | 0

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Create array tm and Tm corresponding to the midpoints of t and T Temperature steps
tm = t(1:end-1) + delt/2 where delt is the vector we discussed in your previous Question.

1日 前 | 0

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To do arithmetic operations with large arrays going out of memory space
It is not possible to tell MATLAB to store variables on disk, at least not in the way you are describing. You can tell your sys...

1日 前 | 0

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Need to find the local maxima and minima of a cubic function, then write an iterating function.
for j = 0.001:10.1 j increments by 1 else j = j+.001 You are trying to modify the loop control variable. That is legal...

1日 前 | 0

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How to arrange data in cell array
reshape(code, 6, []).'

1日 前 | 0

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fprintf multiple outputs separately
still_in_game = true(1, number_of_players); while any(still_in_game) for player_number = find(still_in_game) %if di...

1日 前 | 1

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Extract eigenvalues and eigenvectors / Symbolic to numeric / Rayleigh-Ritz Method / Vibro-acoustics
https://www.mathworks.com/help/symbolic/eig.html Symbolic eigenvalue does not support generalized eigenvalues.

1日 前 | 0

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combination of integer numbers
[Ag, Bg, Cg, Dg] = ndgrid(0:15); Eg = [Ag(:), Bg(:), Cg(:), Dg(:)]; mask = sum(Eg,2) == 15; selected = Eg(mask,:); a = selec...

1日 前 | 0

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MATLAB file to C compiler Command changes\ Makefile from MATLAB code
MATLAB Coder does not support graphics, except some of the Computer Vision routines to "draw" into arrays, and some specialized ...

1日 前 | 0

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Conditional calculations on a numeric matrix
mask = input > thresholdvalue; result(mask) = input(mask) * 2; result(~mask) = input(mask) / 2;

2日 前 | 0

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Preprocessing using readtable()
Use detectImportOptions() on the csv file, and store the result to a variable. Now modify the DataLines property of the import o...

2日 前 | 0

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How to convert a variable which has binary data in .mat format to .txt?
save() with the -ascii -double options is one way. However, if I recall, this can lose the last bit or two of precision, so if y...

2日 前 | 0

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please help me with this
You have F=[]; inside the loop, so you are throwing away all of the F contents except for the last image.

2日 前 | 0

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Simple Message Encryption with Matricies
>> mod(F(1,:),1) ans = 4.2632564145606e-14 0 0.999999999999943 char() truncates ra...

2日 前 | 0

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Chaotic map, Metaheuristic
The number of sequences is equal to the number number of values representable in the data type you are using, raised to the powe...

2日 前 | 0

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defined n with the equation
"Create as the midstep values are computed" is talking about a for loop with controlling variable n, and for n=2 onwards you cal...

2日 前 | 0

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Real Time audio modification and reproduction trough GUI
You cannot do that for audioplayer objects. In current releases you would use the Audio System Toolbox. In your release yo...

2日 前 | 0

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can anyone help explain to me ?
s2=sum(fliplr(1./(i.^2+i)))+1;

2日 前 | 0

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any trick to stop fminsearch early?
fminsearch permits options that include Outputfcn and that function can signal to terminate.

3日 前 | 1

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Hot to locate indices of 2-D data located out of circle?
vector_of_y_values = (1:number_of_rows) - y_center; vector_of_x_values = (1:number_of_columns) - x_center; [Yg, Xg] = ndgrid(v...

3日 前 | 0

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Guide math operation equal.
You need to parse what is in get(handles.text1,'string') . If it is not (optional spaces followed by) = (followed by optional ...

3日 前 | 0

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