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Memory usage very high
How do you observe the memory consumption? The Taskmanager displays the memory reserved for Matlab. If Matlab allocates memory a...

7 years ago | 2

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Return vectors from for loop as columns in matrix
Start with cleaning up the code. The lines Dplus; and Dminus; do nothing, so they are wasting time only and confuse the readers...

7 years ago | 1

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convert lower case to upper and upper to lower
You can use the function isstrprop with the category 'lower' and 'upper' to identify the specific characters. Then use the comma...

7 years ago | 0

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Function run(scriptname) doesn't work.
Store the M-files in a folder, in which you have full access. C:\Users\ is a bad idea. Create a folder somewhere else, e.g. insi...

7 years ago | 0

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Subtracting Vector from a Matrix
Matlab can subtract vectors from matrices automatically since R2016b - so called "auto expanding". Do you use an older version? ...

7 years ago | 1

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Include global variable declaration infunctions
Global variables are a shot in your knee in every case. Hiding them in scripts, which are called dynamically, impedes the debugg...

7 years ago | 0

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deleted old version of Matlab (R2017b) keeps getting back
See https://nektony.com/how-to/uninstall-matlab-mac According to https://www.mathworks.com/help/install/ug/uninstall-mathworks-...

7 years ago | 1

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Answered
I found this bellow code in internet. While I run the code I noticed following errors.
This is a strange and inefficient code. Replace e.g. for i=1:len for j= 2:2 text_names(i,j)=txt(i,j); end ...

7 years ago | 0

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Vectorise or Parallel Computing
This loop cannot be parallelized. If flux_edge is a vector and not a matrix, accumarray would solve the problem efficiently. Try...

7 years ago | 0

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How do I return an extra parameter using Matlab's ODE solvers?
If the problems mentioned in my comment are fixed, the solution is easy: Run the integration at first. Then provide the calcualt...

7 years ago | 1

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Assign column index to output value
An easier way to create the submatrix: submatrix = M(i:end, :); The any() operates along the first non-singelton dimension. Fo...

7 years ago | 0

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Index exceeds the number of array elements (4)
You stop Matlab at the error already by dbstop if error. Then use the debugger to check the sizes of the arrays: size(zplot) s...

7 years ago | 0

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Problem with Matrix indexing using vector
This is a job for sub2ind: a = blkdiag(ones(3),ones(3)); [r,c] = find(a); b = zeros(size(a)); index = su...

7 years ago | 0

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MEX passing Integer - wrong results
This sounds magic. Whenever magic things appear in discussions in the forum, or at programming in general, it is a secure signal...

7 years ago | 2

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how to avoid for loop
A ,ore efficient version of the loop: nb = numel(b) - 1; counts = zeros(1, nb); % Pre-allocation!!! for i = 1:nb co...

7 years ago | 0

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Answered
Using matlab to find vectors that are orthogonal to another vector.
Do you mean 2D vectors? v = rand(1, 2) % Any test vector vp = [-v(2), v(1)] dot(v, vp) % Orthogonal means: dot pro...

7 years ago | 0

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11221 212211 212 12 1
Please post an exact copy of the error message in the forum. A rough paraphrasing will hide important details. Thanks. I assume...

7 years ago | 0

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faster way to add many large matrix in matlab
The main time is spent in rand() in your example. With using ones() instead, the runtime goes from 0.71 sec to 0.25 sec on my ma...

7 years ago | 0

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Answered
Query in applying If command
if (abs(G(j)-O(:))<1) The if command needs a scalar condition. Therefore Matlab inserts an all() to evaluate the vector G(j)-O(...

7 years ago | 0

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Index in position 1 exceeds array bounds (must not exceed 5).
The variable tab has the dimensions 5 x 10. You try to access the indices [100, 5, 10]. This cannot work. I guess, you want to r...

7 years ago | 0

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How to Assign vectors to each dynamic variable name?
Don't do this. See: TUTORIAL: How and why to avoid Eval Hiding an index in the name of variables is a bad idea. Use arrays ins...

7 years ago | 4

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Can I construct a matrix multiplying a scalar and a vector?
No, tis is not a standard multiplication. But you can create k based on i and j: i = 3; j = [4; 5]; % Solution 1: k(:, 2) ...

7 years ago | 1

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How can I maximize a function in Matlab?
Matlab contains some tools for minimization. A maximization does exactlly the same, if you change the sign of the optimization c...

7 years ago | 2

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How do I access a certain directory?
You can define the path of a file to access it: Folder = 'C:\Temp\'; FileList = dir(fullfile(Folder, '*.jpg')); for iFile = 1...

7 years ago | 2

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i wanted the slope with respect to time frame
Maybe all you need is to call the gradient(X.') function, where X is the complete matrix?

7 years ago | 1

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Efficient way to rename files adding prefix from higher rank folder
% Assuming that the Subject_folder's are contained in D:\Your\Folder\ : BasePath = 'D:\Your\Folder\'; BaseLen = length(BasePa...

7 years ago | 2

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i am not able to debug because my window is not showing the debug points
Did you try to create the debug points by clicking in the area behind the line numbers? The file has not been saved. So save it...

7 years ago | 0

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How to shorten space between space in command window
Avoid the \t for formatting the output if you want to get nice ASCII tables. Prefer to define the width: fprintf('%s%10d%10d%10...

7 years ago | 0

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If else Statement in GUI
I guess, that Matlab does exactly what it is expected to do. If h(a)*h(b)>0 is false, Matlab enters the else branch. Although y...

7 years ago | 0

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how to resolve this "not enough input arguments" from the code shown below
objFun=@(mag)summ Now calling objFun calls summ without input arguments. I assume, you mean: objFun = @summ which is a more e...

7 years ago | 0