# José-Luis

Professional Interests: Modeling. As in hydrology, not as in Brad Pitt.

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**Content Feed**

How to "filter" an N-D array with matrix indexing?

data = rand(10,3,3); idx = (1:2:5)'; dims = size(data); to_add = cumprod(dims); for ii = 2:numel(dims) ...

3 years ago | 0

Help with a piece of code

Generating a "binary" (logical) array: a = rand(10,1) > 0.5; Transforming the binary array into a string. _v_ is a charac...

4 years ago | 0

poissrnd function issue: weird histogram

The loop is unnecessary: histogram(poissrnd(100,1e6,1),300) Works as expected.

4 years ago | 1

Transforming a string of letters into number based on each value equaling a number.

str = 'bccddee'; result = sum(str - 'a' + 1)

4 years ago | 2

Do one action to multiple arrays

The answer would be a slight adaptation of _"don't use dynamic variable names"_ with the added issue of not being able to use a ...

4 years ago | 1

How to get rid of repeating values inside an array

b = a(sum(bsxfun(@eq,a,a'))==1)

4 years ago | 1

| accepted

I'm trying to set certain rows in a 3 dimensional matrix 0

Since it is impossible setting them to empty without actually changing your array, you could use NaN instead. data(10,:,2) =...

4 years ago | 0

How can I get values for f in a matrix of dimension(100,1)?

f =@(x,y) (1-x).^2 +100*(y-x.^2).^2; dummy = linspace(-1,1,10); [xx,yy] = ndgrid(dummy,dummy); result = f(xx,yy); ...

4 years ago | 0

Finding specfic string within another string

yourStr = '\blabla\blabla\blabla\blabla\blabla\blabla\04 - Black\05 - TEST' re = '\\[0-9]{2}\s-\s[a-zA-Z]+'; result = re...

4 years ago | 0

How can I plot a polar plot with varying colour

If you have R2016b or more recent: <http://se.mathworks.com/help/matlab/ref/polarscatter.html>

4 years ago | 1

How to run scripts (not functions) with predefined user inputs?

<https://se.mathworks.com/help/matlab/ref/input.html>

4 years ago | 1

Derivative in function handle

If you're gonna do this numerically, you need to specify an interval in which to evaluate. Note that diff doesn't really give th...

4 years ago | 1

How to create a random gamma distributed vector with a mean of 0.1 and entries between 0 and 1?

The <https://se.mathworks.com/help/stats/gamrnd.html gamma distribution> takes two parameters: the shape and the scale. The mean...

4 years ago | 1

| accepted

If I am given coordinates of three points, how can I plot an arc using those 3 points in matlab?

<https://se.mathworks.com/matlabcentral/fileexchange/57668-fit-circle-through-3-points>

4 years ago | 0

Function not supported for code generation

You can't. It's up to the Mathworks to decide which functions to include. You could always ask them nicely. I don't kno...

4 years ago | 0

how to not exceed limits of the matrix column

your_array = rand(10,16) %looping through all columns for ii=your_array %ii now contains all values in column end

4 years ago | 0

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how to density plot of a scatter plot?

<https://se.mathworks.com/help/matlab/ref/histogram2.html |histogram2()|>

4 years ago | 0

Various inputs and outputs in functions

You could pass a structure to your function. The structure could contain whatever flags and arguments you need. Same goes for th...

4 years ago | 0

How can I get a vector out of a matrix?

Sounds like a job for <https://se.mathworks.com/help/matlab/ref/sub2ind.html |sub2ind()|>

4 years ago | 0

How do I exclude NaN values when calculating mean of each row in a matrix?

y = nanmean(a,2)

4 years ago | 1

I want to obtain number of cases(matrix's length) . By applying same sum in any matrix. (on constraints)

If what you mean is that you want the sum of a random array of four elements to be thirty with some condition placed on the last...

4 years ago | 0

What is the use of state in randseed() function?

Random numbers in Matlab are not random. They are pseudo-random: they are based on deterministic algorithms. You can consider...

4 years ago | 0

I unable to run my program.Please help me...

custlogpdf =@(x,d,r) log(factorial(r+x-1)/(factorial(x)*factorial(r-1))+ log(s1));

4 years ago | 0

Why does == not work with decimal indexed for loop?

From the documentation: _"x = j:i:k creates a regularly-spaced vector x using i as the increment between elements. The vector...

4 years ago | 1

| accepted

Check for identical maximum values in an array

Number of maximum values: numMax=sum(A(:) == max(A(:))); if numMax > 1 %Do your thing end

4 years ago | 1

Replot a matlab.graphics.chart

Not sure this is what you mean: numPlots = 10; lH = cell(1,numPlots); for ii = 1:numPlots hold on; ...

4 years ago | 0

what can be maximum number number of alphabet in name of model ?

From the documentation: _"Model Names:_ _Model file names must start with a letter and can contain letters, numbers, and u...

4 years ago | 0

| accepted

How to change the output file name with the same input file name but with a different extension ?

old = 'BOB_LEHAR_CS_2013112718_TRMM.nc'; new = regexprep(old, '\.[^.]+$', '.grd')

4 years ago | 0

Turning x amount of data points in to 100 to get a percentage

If you have the signal processing toolbox: <https://se.mathworks.com/help/signal/ref/resample.html>

4 years ago | 0

| accepted

How much is (in kms) 1 degree of Longitude in the Earth?

<https://se.mathworks.com/help/map/ref/deg2km.html> Or perhaps: <https://se.mathworks.com/help/map/ref/stdist.html> pro...

4 years ago | 0