# Riccardo Scorretti

### Lab. Ampère - UMR 5005 CNRS, France

**Programming Languages:**

C, MATLAB

**Spoken Languages:**

English, French, Italian

**Professional Interests:**

Electromagnetics, Finite Element Analysis (FEA)

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**Content Feed**

how to plot graph for specific points

Assuming that variables a, b, ... j make sense, you can do more or less like this: x = [1 2 3 4 5 7 8 9]; y = [a b c d e f g h...

3 months ago | 0

| accepted

how to differentiate this function

Assuming that you want to differentiate ph and a with respect of r, you have several options (and the best option depends on wha...

3 months ago | 0

contour level appointing problem

Hi Asliddin, the problem is that in your own data sometimes the value for which you wish to plot the isovalue does not exist. S...

3 months ago | 0

if else statement with strings

That's being said, your problem is (most probably) that you wish to ask the user to enter a string: filter_option = input(msgou...

3 months ago | 0

| accepted

functions not working for a matrix created in for loop.

It gives that error the second time you run the code; the very first time it works nice. The problem is that in the last line: ...

3 months ago | 1

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How do I make my fprintf columns output neatly?

Hi. I think it is better to work with fixed length fields rather than tabulations (which have the problem of being system-depend...

3 months ago | 1

Colormap limits between 0 and 1

I think you have to rescale the plotted quantity. That is: val = mean(abs(Ex).^2 + abs(Ey).^2, 3); val = val / max(val(:)); p...

3 months ago | 0

| accepted

How to distribute random number of users within the different circles

That's ok? % Coordinates (x0,y0), radius (rad) and number of users (nbu) for each circle x0 = [100 450 500 650 900 900 800]...

3 months ago | 0

Table define colums in more columns

Perhaps you need something like this? load Test_Table.mat tab = table('Size', [numel(Test_Table) 3], ... 'VariableNames',...

3 months ago | 1

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Why these two similar operations (a sparse matrix w/o transpose times a vector) take different time to finish?

Interesting. I tried to see what happens with matrix of different sizes: n = round(logspace(1, 6, 30)); t = []; figure for k...

3 months ago | 0

| accepted

Diagonal sums with non-zero elements

Hi Ingrid, I guess you mean you want to compute te sum of the diagonals of the permuted matrices containing all non-zero elemen...

3 months ago | 1

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How to correct the error in code?

Hi Susan, there is a macroscopic error in your code: F1=@(A)(-H(x,:).*log(1+A(x,:))+a1(k).*(G(x,:)-A(x,:))); You defined an...

3 months ago | 2

| accepted

Error while using a function instead of a .csv file

n = 5:40; % these are the limits of the function n runs from 5 to 40: you are bound to have problems when trying to evaluat...

3 months ago | 0

Coding a "Are you sure you want to exit?" prompt when exiting app GUI

You could modify the code of callback ExitPressed more or less in this way: answer = questdlg('Are you sure you want to exit?',...

3 months ago | 0

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Eig Argument Command Error

Hi. The problem is not with the size of K and M; the problem is that in your code K and M are symblic variables. Juste convert t...

3 months ago | 0

i m trying interpret this simple matrix code..

rand('seed',345); B = randi([-150,300], 10, 7); [y,in] = sort(B(:,3)); You are sorting a column vector (= the 3rd column of B...

3 months ago | 1

for loop to evaluate every minute

% Setup variables data = [ 20 1 20 1 0 0 375 0 200 0 20 1 50 0 150 0 ...

3 months ago | 0

Calculate the required area

Let's start by checking the function g = profile of your building: g = @(x, y) 1./((2+1.1.*x.^2+1.1.*y.^2).^(1/2)); a=0.0; b=...

4 months ago | 2

| accepted

Can a for statment contain a matrix

The problem is formulated in a somehow unclear way. However, assume that we have a 200x1 matrix: % Generate some random data, f...

4 months ago | 0

| accepted

several minimum values on a vector

I'm not sure to understand completely the question, hower you can use find to get all the values which are strictly equal to the...

4 months ago | 0

How to integrate given the two data columns

Most probably like this: CHARGE = sum(CURRENT(1:end-1) .* diff(tz));

4 months ago | 0

Reversing a part of matrix

Another way (more efficient, I think) is to do a swp by hand: M=[10 20 30 40 50 60 70 80 90 100]; t = randsample(10, 2) % I ...

4 months ago | 0

Reversing a part of matrix

A possible way is to pass through an vector of index (= ind in the code hereafter): M=[10 20 30 40 50 60 70 80 90 100]; t = ra...

4 months ago | 0

How to resize UI table to fill window?

Hi Logan, setting Units to normalized is not enough: you have to modify also the property Position: LastName = {'Sanchez';'Jo...

4 months ago | 0

I would like my code to allow the user to plot as many circles as they want until the user right clicks, if the circle plotted intersects any other circle it must change color

Hi. Here is a possible implementation of what you want. Basically, the set of circles are stored in arrays setOf_xc, setOf_yc an...

4 months ago | 1

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There is a problem with the find function

Dear 文辉 沈 , the result you obtain is quite logical. Consider the following example: bw = zeros(4, 5) ; bw(end,2:4) = 1 You a...

4 months ago | 0

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Solving Inverse Kinematics using pseudo-inverse Jacobian method

Hi David, there were several errors in your script (see below, see also the remark of @Torsten). After fixing them, your program...

4 months ago | 0

| accepted

How to plot pixel intensity as a function of pixel position (beginner)

Hi. You obtain an empty plot because you use mean2, which returns the average of the full image (= a single value): % Load the ...

4 months ago | 1

| accepted

Solving Inverse Kinematics using pseudo-inverse Jacobian method

Hi David, in your code you tried to use the Symbolic Computational Toolbox. Personally, for such a problem I prefer to go nume...

4 months ago | 0

How can I locate a vortex center?

Nice problem! I propose the solution based on the rationale that the center of the vortex (assuming that there is only one vorte...

4 months ago | 3

| accepted