# Jan

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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**Content Feed**

How do I get r2016a?

I'm not sure if this shortcut is working for you: https://www.mathworks.com/downloads/ If not, open "May Account" on your prof...

23 hours ago | 0

Code for romberg integration using recursion

The posted code runs without an error in R2021b. eps_step = 1e-5; N = 11; a = 0; b = 1; R = zeros( N + 1, N + 1 ); h = b -...

23 hours ago | 0

How to decompose 3d array to 3 matrices

x = rand(51, 71, 3); v = reshape(x(:, 27, :), [], 1); size(v)

2 days ago | 0

How to accelerate the permute for 3D matrix

You can't. permute works efficiently already.

2 days ago | 0

How to download data using proper link

FileName = 'prov.postprocess+sMpAn+dMOD08_M3_6_1_Deep_Blue_Aerosol_Optical_Depth_550_Land_Mean_Mean+zNA+t20010101000000_20201231...

2 days ago | 0

Generate a matrix of combinations without repetition (array exceeds maximum array size preference)

Instead of permuting [0,0,1,1] and removing the duplicates, you can obtain the list of indices of the ones (or zeros): M1 = uni...

2 days ago | 1

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Infinite looping: Knowing its presence in a big program?

See: https://en.wikipedia.org/wiki/Halting_problem You can prove, that there are no "tricks" to determine securely in advance i...

2 days ago | 1

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Run two scripts simultaneously matlab

The easiest way is to start 2 Matlab sessions.

2 days ago | 0

Sorting cell for only dublicate values

Is the input really a cell containging strings? Or a cell string? Ort a string array? % Test data with a cell string: data = s...

2 days ago | 1

Divided difference(Newton metod)

There was a missing closing parenthesis. The trailing esmivolon suppresses the output. If you omit it, this is displayed: test ...

3 days ago | 0

why is my vector empty

for i=1:size(A,1) disp(double(A{i})) end i = size(A,1) now. Then: row_=(double(A{i})); Is a vector of the ASCII values o...

4 days ago | 0

Add a textbox in a subplots inside a loop

Move the repeated code out of the loop to simplify the code: z = [0.44, 4.7, 7, 8, 17.9, 31, 57]; dim = [.2 .5 .3 .3]; c ...

4 days ago | 0

Why does mldivide solve equations so fast that FORTRAN can't compare it？

Matlab's code for the matrix division is not made public. Internally optimized BLAS libraries and MKL are used. The taskmanager ...

4 days ago | 0

Converting a binary matrix to decimal.

The error message is clear: bin2dec requires a CHAR vector as input or a cell string. See: doc bin2dec You provide a numerical...

4 days ago | 1

Error in Bvp4c

You define the variable beta on top of the code, but this does not mean, that it is known in all subfunctions. Pr, gamma and lam...

4 days ago | 0

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How to normalize a matrix in such a wat that every row sum of X(:,:,i) should be 1 except for ith row

X = rand(6, 3, 6); N = sum(X, 2); N(sub2ind(size(N), 1:6, ones(1,6), 1:6)) = 1; Y = X ./ N; Now sum(Y(i, :, j)) is 1 is i~=j...

4 days ago | 0

Faster for loops/or how to cut some time

a=randn(50,1); b=randn(50,1); tic [aa,bb]=using_cells2(a,b); eloopC=length(aa); eloopP=length(bb); for i=1:(eloopC) ...

5 days ago | 0

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Get the time of the messages

Try: Time_Matching = Time_AIS1(msg_match{K}) % curly braces

5 days ago | 0

find maximum number in a range of data

In max(T(S1,6)) you are searching in the submatrix T(S1, :). But you use the result as index in the full matrix T. You want to a...

5 days ago | 0

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How do i plot equal size of circle in square(100*100 m^2) without overlapping?

This is an extremly challeging task. See https://en.wikipedia.org/wiki/Circle_packing https://en.wikipedia.org/wiki/Circle_pac...

5 days ago | 1

cannot calculate mean on for loop

The elements of neg_m are overwritten repeatedly in the inner loop. Maybe you want: for ni = 1:35 neg_m(ni, :) = mean(resh...

6 days ago | 0

How to make the negative sign in the legend easier to see?

strcat removes interior spaces. This is not useful here and it is not in general. I consider this as a design error. Use cat in...

7 days ago | 0

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Index exceeds the number of array elements (1)

Replace for j = 1:n-1 by for j = 1:i-1 By the way, you can write s = 0; for j = 1:i - 1 s = s + U(i, j) * x(j); ...

7 days ago | 1

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How can I create three different axis?

See e.g.: https://www.mathworks.com/matlabcentral/fileexchange/67349-plot-with-multiple-y-axes https://www.mathworks.com/matl...

7 days ago | 0

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How to shuffle two matrices in a consistent manner

I assume, X is a matrix and you want to shuffle the rows. Then: X = X(P, :); % ^

7 days ago | 1

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How to get rid of a loop that depends on its previous iterations

Start with calculating the average manually instead of the slower mean() function: % Timings: R2018b, Win10, i7 data0 = rand(1...

8 days ago | 0

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Solving problem with ODE45

In the loop you are calculating the integration from 0 to 2*t(i) with the initial value set to y2(i-1, :). But this is another i...

10 days ago | 0

Check for equality in the contents of two arrays ignoring order

unique, setdiff, union and ismember call the function sort also internally. So % assert(isequal(sort(A), sort(B))) Is a very e...

10 days ago | 0

How to identify duplicate values in an n dimensional array , then club the linked values related to it in another array

A = [ 1 8 10 4; ... 1 8 4 0]; T = isMultiple(A); B = A(T) % ? or what do you want? A(T) = 0; functi...

10 days ago | 0

Iteration Involving 1x4 matrix

while abs(P - Pgiven) > 1e-6 ... end

10 days ago | 0

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