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Fabio Freschi


Politecnico di Torino

108 total contributions since 2014

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Answered
problem with fzero in my code
your fun is neither acceppting nor using inputs You should write the symbolic function like this fun = @(x)cos(x); x0 = fzero...

5 hours ago | 0

Answered
how can i slove this proplem "- The vector V is given by V=[2 8 7 3 1 0 8 9]. Write down a single instruction to produce a vector that contains 1 in the place of the odd numbers and -1 in the place of the even numbers."
A suggestion: you can easily find the reminder of the division by 2, so that even numers have reminder 0 and odd numbers reminde...

19 hours ago | 0

Answered
Operands to the || and && operators must be convertible to logical scalar values.
If you work with arrays, use the single & and not &&

20 hours ago | 0

Answered
How to use fzero in a loop to obtain the first 3 positve solutions for cos3x=sin3x?
fzero gives you only one solution. In case of multiple roots, the choice depends on the initial choice and on the algorithm. If ...

20 hours ago | 0

Answered
how to write a code to extract a positive latitude value for the corresponding positive longitudinal cell value
% filter idx = longitudinal >= 50 & longitudinal <= 100 & latitude >= 0 & latitude <= 40; % selection longitudinal2 = longi...

22 hours ago | 0

Answered
Making a vector out of all even and odd numbers using for, if
This happens because the original vector contains random numbers that change every time you run the code. So, also the number of...

22 hours ago | 0

Answered
Error using plot Vectors must be the same length.
Some comments 1) Q is defined twice as symbolic variable, but it is actually an array 2) in the first loop N = 4, so length(t)...

2 days ago | 0

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Answered
Optimisation of function containing matrix
While waiting for the data, I try to solve one of the questions. you can set the missing constraint as x1-x2 = 0 x2-x3 = 0 .....

3 days ago | 0

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Answered
How to plot points on a line
I suggest you to check hold on, and the LineSpec of the command plot % your data new = rand(5,1); % open figure and retain ...

4 days ago | 1

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Answered
How to break an image into blocks?
Three assumprions 1) the image is a 2d matrix 2) the row/cols have 64x3, 3x64 and 3x3 blocks 3) you want 10 sub images, not 1...

4 days ago | 0

Answered
Optimization problem using external program
I can figure out two solutions 1) check if the simulation program has API for running it from "outside". In this case, make ref...

4 days ago | 0

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Answered
Intersections between 2 graphs
Try this software on fex https://it.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections

4 days ago | 0

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Answered
Adjusting the resolution of the time vector
Try pdeval and supply the solution of pdepe

5 days ago | 0

Answered
Why my integration is like this?
You are calulating an indefinte integral that has an integration constant by definition. Matlab int command doesn't add the inte...

5 days ago | 0

Answered
Calculate the angle between plane normal and a point it cuts
using the definition of dot product: % angle function in radians ang = @(u,v)acos(dot(u,v)/(norm(u)*norm(v))); % data u = ...

5 days ago | 0

Answered
How to obtain the original matrix after performing symrcm or symamd in MATLAB?
Can you share the symV original matrix?

5 days ago | 0

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Answered
Create an array from other array
x = [-V(:) -M(:)]; The column operator here reshapes the vector into a column vector

6 days ago | 0

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Answered
Cumalative sum of each row of the matrix and the matrix array, separately
For the matrix Msum = cumsum(M,2) For the cell array Gsum = cellfun(@cumsum,G,'UniformOutput',false)

6 days ago | 2

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Answered
counting the number of clusters
% unique indices idx = unique(data(:,1)); % clusters cluster = arrayfun(@(idx)data(data(:,1) == idx,2),idx,'UniformOutput'...

6 days ago | 0

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Answered
How to extract numbers with its corresponding numbers in the next column from a file?
Does this solve your question? % complete data UD = load('APP_C20_1_Press_Unfiltered.txt'); DataGreaterThan1000 = UD(UD(:...

6 days ago | 1

Answered
How to write a for loop that indexes the variable name and the funciton?
Don't do that! Check this out: https://it.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-...

6 days ago | 1

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Answered
How to obtain the original matrix after performing symrcm or symamd in MATLAB?
Try this: % matrix dimensions N = 5; % create symmetric matrix A = rand(N); A = A+A.'; % symrcm sorting p = symrcm(A)...

6 days ago | 0

Answered
Trying to recreates the center of mass from equation
Macroscopically, I see two main issues 1) third line [n,-] = size(qDat); should be (tilde sign) [n,~] = size(qDat); 2) last...

6 days ago | 0

Answered
how to fill a matrix?
If I understand correctly % number of measurements med = 8; % preallocation VecVal = zeros(1,med); % the measurement X...

6 days ago | 0

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Answered
Function with two inputs and arguments
The & is misused. Try: function [xp,xm] = find_roots(a,b,c) if b^2-4*a*c<0 xp=888; xm=888; else xp=(-b/(2*a))+...

6 days ago | 1

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Answered
Creating Random Coordinates Inside a Fixed Points
% geometry data xMax = 12; yMax = 8; rCircle = 2; % number of points N = 1000; % points iside the rectangle P = bsxfu...

17 days ago | 2

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Answered
I want to Plot a triangle using points p, q ,and r. Also, I need to show vectors PQ and PR starting from p and their cross product vector V
Replace the first plot with % plot vertices plot3([p(1); q(1); r(1); p(1)],[p(2); q(2); r(2); p(2)],[p(3); q(3); r(3); p(3)],...

17 days ago | 0

Answered
How do I make matrix of ones and zeros alternating depending on size and elements of an array?
% initialize iRow = []; jCol = []; % preallocate B = zeros((length(A)+1)/2,sum(A)); % indices for columns idx = [0; ...

18 days ago | 1

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Answered
I want to Plot a triangle using points p, q ,and r. Also, I need to show vectors PQ and PR starting from p and their cross product vector V
p = [15,20,14]; q = [19,21,9]; r = [16,19,11]; % open figure and setup view figure, hold on view([1 1 1]); % plot vert...

18 days ago | 1

Answered
How to extract values from a field of a stucture?
I don't have the data so I cannot test it. Try % select the Scenario iScenario = 1; % plot surf(Dati.X,Dati.Y,Dati.Val(iSc...

18 days ago | 1

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