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Fabio Freschi


Politecnico di Torino

166 total contributions since 2014

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Answered
defined n with the equation
n= size(P4,1)

5 jours ago | 0

Answered
Array indices must be positive integers or logical values
Your index k starts from 0 and you are indexing h with k, so you are asking at the first iteration h(0). Matlab has 1-indexing s...

5 jours ago | 0

Answered
while loop performance improvement
I don't know the starting value of k, assuming it is 1 idx = 1:rate:period mysum = sum(array(idx,2)); % note that sum is the n...

5 jours ago | 1

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Answered
Euler method error in code Index exceeds the number of array elements (1). in my my code
Checking the sintax of the code only I see 3 issues 1) In the for loop you wrote a(400-x(n)), that is you are addressing the po...

5 jours ago | 1

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Answered
Population growth in 7 years
% rate r = 0.0063; % years t = 7; % initial population a = 5e6; % population y = a*(1+r)^t

7 jours ago | 2

| accepted

Answered
Apply operation to each element of an array
You should use element-wise operations https://it.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html In you...

7 jours ago | 0

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Answered
How do you solve for a double sum
There are some things that are vgue, like the x-axis, in any case, this code shows something similar to the desired result clea...

9 jours ago | 1

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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-...

11 jours 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...

11 jours ago | 0

Answered
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...

12 jours 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

12 jours 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;

13 jours ago | 0

Answered
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 ...

13 jours ago | 0

Answered
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...

13 jours ago | 0

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Answered
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...

14 jours 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...

14 jours 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 ...

15 jours 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 = (...

16 jours 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;

16 jours ago | 1

| accepted

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...

18 jours ago | 1

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

21 jours ago | 1

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

21 jours 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...

22 jours 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...

23 jours 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 = ...

24 jours 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...

24 jours 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...

24 jours 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 ...

24 jours 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 ...

24 jours 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...

24 jours ago | 0

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