Fabio Freschi

Last seen: 4 días ago

Politecnico di Torino

212 total contributions since 2014

Fabio Freschi's Badges

Answered
how to find parallel of resistors
Maybe it's too late for the OP, but for the records, I usually use an anonymous function with multiple inputs % ananymous paral...

4 días ago | 0

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

4 meses ago | 0

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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...

6 meses 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...

6 meses ago | 0

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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...

6 meses ago | 0

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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...

6 meses 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...

6 meses 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

6 meses ago | 0

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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 ...

6 meses 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...

6 meses ago | 0

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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...

6 meses ago | 0

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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...

7 meses ago | 0

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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...

7 meses ago | 0

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

8 meses ago | 0

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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...

9 meses ago | 0

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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...

9 meses 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...

9 meses 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...

9 meses 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 ...

9 meses ago | 0

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

9 meses ago | 0

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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] ...

9 meses ago | 0

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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...

9 meses ago | 0

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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...

9 meses ago | 0

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

9 meses ago | 0

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

9 meses ago | 0

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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)));

9 meses ago | 0

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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;

11 meses ago | 0

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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...

11 meses 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...

11 meses ago | 1

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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...

11 meses ago | 1