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# José-Luis

879 total contributions since 2009

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

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Save data to .txt file
To write a text file with columns of data that have variable names, use the “writetable” function. First, create the data to wri...

3 maanden ago | 7

| accepted

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) ...

meer dan een jaar 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...

meer dan een jaar ago | 0

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

meer dan een jaar ago | 1

Transforming a string of letters into number based on each value equaling a number.
str = 'bccddee'; result = sum(str - 'a' + 1)

meer dan een jaar 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 ...

meer dan een jaar ago | 1

How to get rid of repeating values inside an array
b = a(sum(bsxfun(@eq,a,a'))==1)

meer dan een jaar 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) =...

meer dan een jaar 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); ...

meer dan een jaar 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...

meer dan een jaar 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>

meer dan een jaar ago | 1

How to run scripts (not functions) with predefined user inputs?
<https://se.mathworks.com/help/matlab/ref/input.html>

meer dan een jaar 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...

meer dan een jaar ago | 0

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...

meer dan een jaar ago | 1

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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>

meer dan een jaar 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...

meer dan een jaar 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

meer dan een jaar ago | 0

| accepted

how to density plot of a scatter plot?
<https://se.mathworks.com/help/matlab/ref/histogram2.html |histogram2()|>

meer dan een jaar 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...

meer dan een jaar 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()|>

meer dan een jaar ago | 0

How do I exclude NaN values when calculating mean of each row in a matrix?
y = nanmean(a,2)

meer dan een jaar 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...

meer dan een jaar 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...

meer dan een jaar ago | 0

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

meer dan een jaar 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...

meer dan een jaar 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

meer dan een jaar 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; ...

meer dan een jaar 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...

meer dan een jaar ago | 0

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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')

meer dan een jaar ago | 0