Community Profile # Jan

Last seen: Today Active since 2009

It is easier to solve a problem than to guess, what the problem is.

Questions about FileExchange submissions are welcome - get my address from the code. I do not answer mails concerning questions in the forum.

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Why stock DOT function is suboptimally implemented
In dot.m we find a test for integer types, checks by isvector, comparison of lengths, both vectors are shaped by (:) and after a...

11 hours ago | 0

Save disp output as a string/cell variable
Since Matlab R2021a: str = formattedDisplayText(x)

12 hours ago | 0

How can I translate one matrix into a new one based on given old and new (row, column) indices?
Z = [1:4; 5:8; 9:12; 13:16]; MatShift(Z, [-1, -1]) MatShift(Z, [2, 2]) function Y = MatShift(Z, Shift) % Input: Z: Matrix,...

1 day ago | 0

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How to find out point of change of sequence of ones and zeros?
What do you expect in the other rows of the 4th column? All rows must have the same number of columns, according to the definiti...

1 day ago | 0

Send "abort signal" to MEX
You could check from inside the MEX function, is a key is pressed. Or you can use mexCallMATLAB to run a drawnow command and re...

1 day ago | 0

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How to write cyclic permutation as an array in matlab?
P = [1 4 6 2 5 7 8 3]; Q = zeros(size(P)); Q(circshift(P, -1)) = P P = [22, 35, 17, 9, 11, 23, 56, 43, 25, 19, 26, 15, 28, 30...

2 days ago | 0

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Please contact the Matlab sales team. As far as I know, you can get trial versions of the newest version only, but MathWoorks m...

2 days ago | 0

error: Index exceeds the number of array elements (1).
Do not use the name "sum" for a variable. Avterwards the function with the same name is shadowed: clear sum sum(1:10) % wor...

2 days ago | 0

How to handle a large binary vector?
UINT8 oder Logical use 1 byte per value. 225 MB are usually fine. You can store the bits packed in UINT8 also, but this is harde...

2 days ago | 0

I am trying to create an array h of size 1001 which can store value of 2 integrals
gl=10; gr=10; N=1000; L=10; l=10; syms x; i = 1; f = gl * (7 / 44) * (exp((-1 * (L-N) * i) / (N * l * cos(x)))); B = vpa...

3 days ago | 1

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"Unrecognized function or variable 'filename'. Error in audioread (line 82) filename = convertStringsToChars(filename);'
A very bold guess: Are you working with admin privileges? Did you open the file audioread.m and overwrite the first line of cod...

3 days ago | 0

How can I get image file in web app?
You are not the only person with this problem. See: https://www.mathworks.com/matlabcentral/answers/884084-problems-with-uigetfi...

3 days ago | 0

generate a sine and cosine wave with 4 cycles .
0:1:3 is [0,1,2,3]. This is less than 4 cycles. 4 cycles mean: x = 0:0.1:8*pi stem() is working. plot(x,y, '.') is an option a...

3 days ago | 0

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matlab percentage always showing zero
After: p = p ./ numel(I), sum(p) is not 1.0, but 0.333. You do not want to divide by numel(I), but by numel(Red), or equivalentl...

3 days ago | 0

How to pre-allocate a matrix (from cell) when dimensions change
Simplify C=cell2mat(B(r)); to C = B{r}; This creates a cheap shared data copy, so C does not occupy additional memory: it re...

4 days ago | 0

Element wise cell division
S{i,j} ./ (S{i,j} - V{i,j}) = 1 ./ (1 - V{i,j} ./ S{i,j}) and for all V and S the division V ./ S replies the elements -6.

4 days ago | 1

"Unrecognized function or variable 'filename'. Error in audioread (line 82) filename = convertStringsToChars(filename);'
Your variable "info" is a struct, not a char vector or string. info = audioinfo('Off of Newton Exit 17.wav'); [Y, FS] = aud...

4 days ago | 0

plz help how can repetition rows matrix
a = [1 0 0; 0 0 1; 0 1 0]; rows = size(a, 1); n = 5; index = rem(0:n-1, rows) + 1 b = a(index, :)

4 days ago | 0

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Creating Matrix provided elements
A = rand(4) + 1i * rand(4); A = A + A'; % Hermitian % Convert to vector: D = diag(A).'; L = triu(A, 1); Lf = L(L ~= 0...

4 days ago | 1

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If statement in a for loop
The if Commadn needs a scalar condition. Because NewDist(:) < 1 is a vector, Matlab inserts an all() automatically. So your code...

5 days ago | 1

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check ismember for each element individually
You want to get a logical vector for each element, which is TRUE for the matching elements. Then this is efficient: a = [1 2 3 ...

6 days ago | 0

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How do I run a custom function when my toolbox gets installed?
How is the toolbox "regularly distributed"? It is usual, that a toolbox or software has a "configure" function to set up the en...

7 days ago | 0

how to implement this in a better way or what is the mistake
Use the debugger: dbstop if error Run your code afterwards until Matlab stops at the error. Then check: size((xs-X)/r) size(...

7 days ago | 0

Applying 'if' condition within location-dependent thermal Properties
After defining ro_ult = @(location,state) ro_d-(ro_d-ro_s)*exp(location.y/0.06); ro_ult is a function handle, which expects tw...

7 days ago | 0

add different number of zeros in the beginning of a matrix
The output cannot be a matrix, as Dyuman Joshi told you already, because in a matrix all rows must have the same number of eleme...

8 days ago | 1

How do i end my code
You have showed some code, which runs once only. The output shows, that this function is called again afterwards, but we do not ...

8 days ago | 0

How to use the MATLAB radio button to switch between 2 matrices
Check the value of the radio buttons in the callback, which starts the computations. Then use the wanted matrix accordingly. A ...

8 days ago | 0

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How to simply the code
With some guessing: Value = cat(1, C{:, 2}); Index = find(Value >= 2, 1, 'first') - 1; if ~isempty(Index) % [EDITED] T...

8 days ago | 0

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non linear coupled diff equation
What about simplifying the equations? 1. dx/dt = -(r+r1)/L1*x - dy/dt * (L12/L1) 2. dy/dt = -y*r2 - dx/dt * (L12/L2) 1. int...

8 days ago | 0

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