function doesnt works well

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Hi, I am using this function;
function [s,tint] = spei(t,prec,pevap,varargin)
But, I am not sure what is varargin works for?
The size of my file are;
Error using spei (line 40)
Expected a string scalar or character vector for the parameter name.
Rik on 20 Dec 2021
Function posted in duplicate question:
function [spei_index]=calculate_spei(t,prec,pevap,varargin);
[nlon, nlat, n]=size(prec);
for i=1:nlon
for j=1:nlat
if isnan(prec(i,j,1))==0

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Answers (2)

Walter Roberson
Walter Roberson on 20 Dec 2021
spei_index(i,j,:) = spei(t, prec(i,j,:), pevap(i,j,:), varargin{:} );
is my guess.
Nurul Ain Basirah Zakaria
Nurul Ain Basirah Zakaria on 21 Dec 2021
but, this is my error
Error using rect2cube (line 46)
Error: Dimensions of the gridsize must match the number of columns in A2.
Error in spei (line 117)
s = rect2cube(s,gridsize);

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Rik on 20 Dec 2021
varargin is typically used to capture optional input arguments:
help varargin
VARARGIN Variable length input argument list. Allows any number of arguments to a function. The variable VARARGIN is a cell array containing the optional arguments to the function. VARARGIN must be declared as the last input argument and collects all the inputs from that point onwards. In the declaration, VARARGIN must be lowercase (i.e., varargin). For example, the function, function myplot(x,varargin) plot(x,varargin{:}) collects all the inputs starting with the second input into the variable "varargin". MYPLOT uses the comma-separated list syntax varargin{:} to pass the optional parameters to plot. The call, myplot(sin(0:.1:1),'color',[.5 .7 .3],'linestyle',':') results in varargin being a 1-by-4 cell array containing the values 'color', [.5 .7 .3], 'linestyle', and ':'. See also VARARGOUT, NARGIN, NARGOUT, INPUTNAME, FUNCTION, LISTS, PAREN. Documentation for varargin doc varargin
Since you don't use the optional/unnamed inputs, there shouldn't be any issues.
The function you're using should have documentation explaining how to use it. Read it. If you don't understand it, please provide a reference to where you got this function (as I can't find it).
Walter Roberson
Walter Roberson on 21 Dec 2021
In that case my suggestion was correct.

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