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Fabio Freschi


Politecnico di Torino

159 total contributions since 2014

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Answered
Solving System of Equations
It seems you are solving a numeric system of equations. Why don't you simply put the coefficient matrix in A and the right-hand-...

1 day ago | 0

Answered
Finding values within a matrix
It is difficult to answer because we don't have the data files 'areatemp1' and 'machtemp1'. In any case in your if statement yo...

1 day ago | 0

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Making a 3D Matrix and Adding Matrices to make a bigger matrix
In the loop, you wrote T(i+k-1,j+k-1) = d(i,j,k-1); k starts from one, so you are trying to access the d(i,j,0) elemen...

2 days ago | 0

Answered
Computational Electromagnetics and MATLAB
This could be a good start https://it.mathworks.com/academia/books/computational-electromagnetics-with-matlab-sadiku.html

2 days ago | 1

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Answered
Why am i getting the : errir using inv ,Matrix must be square?
As James Tursa said, inv(H) is not defined when H is not square. If you have the matrix H and the rhs g, simply use f = H\g;

3 days ago | 0

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Struggling to Vectorize the following Code.
Almost all execution time is due to the plot function as highlighted by the profiler: You can call the plot only once at the ...

3 days ago | 0

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How can I pick certain element from each row of an array ?
I see that the edges shared by two triangles are not duplicated. To check for this case I sorted the nodes and the edges. Let me...

3 days ago | 0

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Combining my newton's method function for nonlinear equations and my lu decomposition function.
Is this what you are asking for? delta = LUgauss(J(x0),-F_value); Note that the buil-in lu Matlab function can do the work for...

5 days ago | 0

Answered
How to sum over rows within specific ranges without for loop?
Not sure if it is the best way, but this seems to work index = [0; cumsum(B)]; C = cell2mat(arrayfun(@(i)sum(A(index(i)+1:in...

5 days ago | 0

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Answered
Removing Outbound (out of range) data from an array
% dimension N = 1000000; % data in (0,1) x = rand(N,1); % threshold xMin = 0.25; xMax = 0.75; % remove data out of ...

6 days ago | 0

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Answered
How to select specific values and corresponding cell positions from 31 x 12 matrix?
Because the number of rows in B is not fixed, you can store the result of your check in a cell array % create the matrix A = (...

7 days ago | 0

Answered
I have a problem with integration "Error using / Matrix dimensions must agree"
When you define your functions use ./ instead of / %function f=(x+(1./x)).^2; %real value of integral ff=@(x)(x+(1./x)).^2;

7 days ago | 1

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Answered
Cause of: "Error: Inputs must be floats, namely single or double."
What I can see is 1) Fs is missing. In any case, tspan shpuld be a 2 entries array with initial and final values tspan = [0,15...

9 days ago | 1

Answered
how to convert cell to matrix ?
A = cell2mat(cellfun(@str2num,x,'UniformOutput',false))

12 days ago | 1

Answered
Possible to modify only one portion of an array in one line?
x(x > xMax & 1:length(x) > transition) = xMax

12 days ago | 2

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Answered
How to compare the closest value in the matrix?
% your data unknownM = [0.8105 1.1581 0.6295 0.9594 0.8447 0.7103 0.8429 0.5372 0.9882 0.8924]; sud...

13 days ago | 0

Answered
how can I create a 4D matrix and use it for interpolation
% your vectors Wpig=0.5:0.5:7; Chla=0.5:0.01:0.6; Starch=0:0.04:0.24; Now you need to sample uniformly the space using your...

14 days ago | 0

Answered
How can i break down the values of vector into group of five?
If x is your vector you can reshape it y = reshape(x,5,numel(x)/5); and access each column with indexing % column 10 iCol = ...

14 days ago | 0

Answered
index in position 2 exceeds array bounds ( must not exceed 1).
Difficult to say without file, code, etc. The wizard says that the new excel file has only one column, but the code expects tw...

14 days ago | 0

Answered
if statement in for loop with cell arrays
To stick with the OP snippet I added semicolons all over the place I changed the variable type in s.score to doubles I preall...

14 days ago | 0

Answered
How to create an array and fill it by these values using loop ?
% intialization and preallocation k = 1; date = strings(480,1); % string array for i = 1982:2015 for j = 1:12 ...

14 days ago | 0

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Answered
Monte Carlo integration of sin(x)
This code evaluates the integral using the Monte Carlo method with increasing number of random samples, compare the result with ...

14 days ago | 0

Answered
Check if a number is in between two values
% your data a = [1,2,3,4,5,6]' b = [10,11,12,13,14,15]' Interval = [a b]; % number to check x = 8; % this finds the in...

14 days ago | 0

Answered
Assembling Element Matrices in Finite Element Method Problem
If I have understood correctly, you want to store the local 3x3 matrix in the global matrix. To do so you can (I would say must)...

15 days ago | 1

Answered
How to find corresponding row positions of specific values in a matrix?
The function min will do this for you [B,C] = min(A,[],1);

16 days ago | 0

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Answered
How to convert script from fortran90 to matlab language
Again, it is difficult to check if not all code is available, however I try kB = zeros(10,1); kA = zeros(10,1); kL = 0; kS =...

17 days ago | 1

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Answered
Pad with Nan according to maximum row in cell
I keep all steps separated % the data A = {rand(47,1),rand(80,1),rand(97,1)}; % pad with NaNs A = cellfun(@(x)[x(1:end); N...

17 days ago | 0

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Answered
Keeping Previous Iteration changes
I see two problems in your code 1) the changes are only temporarily saved in x and x is never used 2) onec you change a letter...

17 days ago | 0

Answered
How to get rid of Nan when calculating mean
Following Steven Lord answer I would usE mean(A(isfinite(A)))

19 days ago | 0

Answered
Why is my script not working?
I try 1) I think you are caluclating the jacobian matrix. To avoid mistakes I did this symbolically and the result is >> syms...

19 days ago | 0

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