# Philippe Lebel

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**Content Feed**

Match numbers with letters

im late to the show, but here we go anyway... clear clc name = 'david'; a = {'a','b','c','d','e','f','g','h','i','j','k','...

2 years ago | 0

How do I add a column vector or matrix to a 6X6 original matrix?

here is an example: clear all zeros_col = zeros(142,1); c11 = (1:142)'; fantastic_matrix = [c11 zeros_col zeros_col zeros_co...

3 years ago | 0

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the loop does not display results

You are not looping over the values of "i" nor "j" i=1:length(X(:,1)) i = 1 2 3 4 5 6 7 ...

3 years ago | 0

Better parallelization than parfor?

maybe take a look at arrayfun(). https://www.mathworks.com/help/matlab/ref/arrayfun.html

3 years ago | 0

Elements of table equal to elements of another table

Here you go: I loop over all station names and check where in the data table i find these names. I generate a boolean index in ...

3 years ago | 0

How to set the function to be able to use all variables in the script without need to be named in the function def?

i would suggest creating a struct containing the required variables. %my script params.a = 1; params.b = "very string" param...

3 years ago | 0

How can i speed up my function?

In order to help you in a significant way, it would be useful to have a sample data set on which we could run the function. On ...

3 years ago | 1

| accepted

Differential equation and problem with minmax

This error message tells you that you don't have the required package installed in order to use the minmax() function. Matlab c...

3 years ago | 0

Decrease time to upload a figure

In addition to @Looky 's answer, try to remove the set(gca, 'YDir','reverse') from the while loop, I'm pretty sure you only n...

3 years ago | 1

How to plot curve with one color without precising which color it is?

aloa for i = 1:10 if i == 1 h = plot(1:10,1:2*i:20*i) v = get(h,'Color'); else plot(1:10,1...

3 years ago | 0

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Deleting plotted image from a figure if conditions are met

If you get the handle of the plot like so: h = plot(1,1,'Xr') you can just delete the handle and the data disapears delete(h)...

3 years ago | 0

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Does anyone know why it is also taking point 9 as convex hull point eventhough it shouldn't?

By observation, points 8, 9 and 10 are on the same line. You have to add a condition to decimate redundant points. (points that...

3 years ago | 0

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How to crop detected face part?

RGB Images are 3D matrices with dimenions = (resolution_x, resolution_y, 3) I suppose the bounding box contains the face. Try ...

3 years ago | 1

How to extract matrix from a bigger matrix based on threshold of each column?

here is my try based on what i understood. given a matrix a nx3: a = [5,6,8;1,2,3;2,3,4;3,4,5;4,5,6] a = 5 6 ...

3 years ago | 0

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Block diagonal matrix of identity times scalar.

here is my take. a=[1,2]; c = round(a(1):1/(length(b(:,1))-1):a(2)); matrix = diag(c);

3 years ago | 0

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add vertical line on a plot for Confidence intervalle.

Have you tried this function? https://www.mathworks.com/help/matlab/ref/errorbar.html

3 years ago | 0

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Is it possible to perform additional operation on job cancellation?

Checkout this function: https://www.mathworks.com/help/matlab/ref/oncleanup.html

3 years ago | 1

How can I fill my cell array?

here is my try: U{1} = [1,2]; U{2} = [2,3]; T = [1,2,3]; S = {}; for i = 1:length(T) temp_cell = {}; k=1; f...

3 years ago | 0

| accepted

How do i create a projectile?

as example for a non-accelerating projectile (which is not your case) this could look like time = 0:1:100; % time goes from 0 t...

3 years ago | 0

Creating Sine wave with random values

here is my try: random_phase_offset = rand(1,1)*2*pi; max_amplitude = 20; random_amplitude = rand(1,1)*max_amplitude; t = ...

3 years ago | 1

Saving each data from for loop

If you want to store elements (like strings) that are not the same size you can use cells. A = {'abc', 'defg', 'hijklmnop', 1...

3 years ago | 0

basic question about matrices

As i think this is an homework i'd suggest reading: https://www.mathworks.com/help/matlab/ref/ones.html https://www.mathworks....

3 years ago | 0

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how can i change an indice in Matrix as vector?

Now i understand. Here is a solution that you can easily expand. clear protein(1).name = 'A'; protain(1).bool_value = [1...

3 years ago | 1

how can i change an indice in Matrix as vector?

I am not sure what you are trying to do as a whole, but if you want to quickly find where there are occurences of a certain stri...

3 years ago | 1

problem in optimization by MATLAB using genetic algorithm

Try to see if the problem is not the same as in this question: https://www.mathworks.com/matlabcentral/answers/76730-genetic-al...

3 years ago | 1

Create a string array (MxN) where each element is a repeated character based off a numeric array (MxN)

try this: B = arrayfun(@(x) repmat('#',1,x),A, 'UniformOutput', false) B = '####' [1x0 char] '#' '####...

3 years ago | 2

Delete - Variance vs standard deviation when using var() and std() with decimal values from CSV file?

Isn't this normal? As the variance is the square of the standard deviation? 0.1^2 = 0.01

3 years ago | 0

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Unknown operation performed.

This is called logical (or boolean) indexing. https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab....

3 years ago | 0

| accepted

Solved

Extract leading non-zero digit

<http://en.wikipedia.org/wiki/Benford%27s_law Benford's Law> states that the distribution of leading digits is not random. This...

3 years ago

Solved

Determine if input is odd

Given the input n, return true if n is odd or false if n is even.

3 years ago