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Fabio Freschi


Last seen: 2 mois ago

Politecnico di Torino

211 total contributions since 2014

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Answered
Nonlinear equation numerical solution
% params C = 1.2; D = 9420; E = -2.0; B = 0.1973; y0 =...

2 mois ago | 0

Answered
Plotting a taylor series function of x^(1/3) centred at x=1728
One option is to use the built-in taylor function in symbolic math toolbox. If you want to use your strategy, there are some is...

3 mois ago | 0

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Answered
Memory efficient alternative for meshgrid?
This is how to make the three-loop version analogous to the meshgrid version % some dummy values N = 300; x = linspace(1,10,N...

3 mois ago | 0

Answered
Sorting Equal Elements of Matrix into Groups in Cell Array
I had the same problem to detect isolated nodes in a graph: conncomp is the matlab command that gets the job done: % create the...

3 mois ago | 0

| accepted

Answered
Error using / Matrix dimensions must agree...
f is a vector, as well as W. So you must use the dotted version of the division (that is ./ that performs the operation elementw...

3 mois ago | 0

Question


Copy Matlab Command Window without diary
Hi everyone, I would like to add an optional function command at the end of a script that logs the command window to a file. I...

3 mois ago | 1 answer | 0

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Answered
Is it possible to create a program on matlab that's works on android?
Sort of https://it.mathworks.com/help/supportpkg/android/run-on-target-hardware.html?s_tid=CRUX_lftnav

3 mois ago | 0

Answered
How to improve my code speed (for loop)
By profiling, the most computational intensive operations are x=T*(probe-ut)'; y=T*(gallery-ut)'; That calculation is inside ...

3 mois ago | 0

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Answered
How to optimize only 2 variables in an objective function with 3 variables?
In this case you can set the upper and lower bound for that specific variable to the same value. Maybe it is not efficient but i...

3 mois ago | 0

Answered
How to optimize only 2 variables in an objective function with 3 variables?
Why don't you remove theta from your objective function definition and call different_function inside function? function object...

3 mois ago | 0

Answered
How to change a column vector into a square a matrix?
Not as elegant as it could be but it works, especially for small matrices % matrix dimension n = 3; % your entries (here du...

4 mois ago | 0

Answered
Calculate acceleration from velocity and time fron excel
acceleration = diff(data.Velocity)./diff(data.Time); Note that this vector has one entry less than the original ones, so you ma...

5 mois ago | 0

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Answered
Subscripted assignment dimension mismatch.
You can use repmat and create a char array function bigstring = string_multiplication(str,N) bigstring = repmat(str,N,1); ...

6 mois ago | 0

Answered
Simulation errors when multiplying matrices
I start a new clean answer You don't have to use the index i inside your matrix like you are doing in your code: in that way yo...

7 mois ago | 0

Answered
Solving Complex Matrix Operations
You can do this in a for loop or using arrayfun % your A vector A = rand(1,1001); % dummy vector % calculation of the matr...

7 mois ago | 0

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Answered
Replicate values in a matrix i-1 times
Quick and dirty for loop A=[1; 4; 8; 3; 2; 6] B = []; for i = 1:length(A) B = [B; repmat(A(i),i,1)]; end You can als...

7 mois ago | 0

Answered
Find independent variables that minimize function
If you have only lower and upper bounds, use them directly in fmincon % your function fun = @(x) ((x(1)-real(0.5*(x(1)-(sqrt(x...

7 mois ago | 0

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Answered
Simulation errors when multiplying matrices
Inside the loop in the first instruction Vn(:,i) is 5x1 but T is 5x5. Matlab now (starting in 2016, I guess) implicitly expands ...

7 mois ago | 0

Answered
Weighted fit using fmincon
How about to repeat the samples of the points you want to weight more?

7 mois ago | 0

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Answered
how to find the optimal value of a matrix that minimize a function?
If I understand correctly the problem can be recast to the following A*W = B*H = F; [a11 a12; a21 a22]*[w1 w2 0 0; 0 0 w3 w4] ...

7 mois ago | 0

| accepted

Answered
plot 2 3D vectors in Matlab
% vectors a = [1 2 -3]; b = [-3 12 -13]; % starting point C0 = [0 0 0]; % put vector in a matrix, to make the code more...

7 mois ago | 0

Answered
Error using sparse Index into matrix must be positive.
Simply remove "-1" from the definition of R. randi returns pseudorandom integers between 1 and the first inupt. The entries of C...

7 mois ago | 0

Answered
How to solve time and space deriavtive using ode45?
Have a look at pdepe: it solves 1-D parabolic and elliptic PDEs

7 mois ago | 0

Answered
Finite Difference Matrix Help
Edit: I changed my answer including a reference and the second order derivative The coefficients for central differences of dif...

7 mois ago | 0

Answered
improved Euler integration scheme (possible code error) in matlab
I think it should be "-" p(1) = (-z(1)*(1-(z(2)))); p(2) = z(2)*(1-(z(1)));

7 mois ago | 0

Answered
Make entries of first row and column of matrix all equal to zero.
% nullify first col B(:,1) = 0; %nullify first row B(1,:) = 0;

8 mois ago | 0

Answered
plot vector using complex numbers
You can use compass or quiver % your matrix A = [-3+4i;-2+5i;1+3i;6+2i;-1-8i]; % with compass figure compass(real(A),imag...

9 mois ago | 0

Answered
constantly receiving an error undefined function or variable z when use solve
Polynomials with a degree greater than 4 do not have explicit solutions. You can use vpa syms x y f1 = y == x^3 f2 = x^2+y^2...

9 mois ago | 0

Answered
How to multiply only some column and rows for a given number?!
You are close to the answer, but you need to keep the first column % your matrix with data A = rand(2,21); % multiply all b...

9 mois ago | 1

Answered
Unstable derivative approximation when steps get too small
This is expected. Look here for details https://blogs.mathworks.com/cleve/2013/10/14/complex-step-differentiation/

9 mois ago | 1

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