function doesnt works well

Question

Nurul Ain Basirah Zakaria 2021-12-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1614780-function-doesnt-works-well

评论： Nurul Ain Basirah Zakaria 2021-12-21

在 MATLAB Online 中打开

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;

t=1x1x420

prec=98x56x420

pevap=98x56x420

Error using spei (line 40)

Expected a string scalar or character vector for the parameter name.

2 个评论
显示无隐藏无

Star Strider 2021-12-20

It will be necessary to carefully read the documentation for the file to understand what the arguments must be, and what their order must be.

Rik 2021-12-20

在 MATLAB Online 中打开

Function posted in duplicate question:

function [spei_index]=calculate_spei(t,prec,pevap,varargin);
[nlon, nlat, n]=size(prec);
prec=squeeze(prec);
for i=1:nlon
    for j=1:nlat
        if isnan(prec(i,j,1))==0
            spei_index(i,j,:)=spei(t,prec(i,j,:),pevap(i,j,:),varargin);
        else
            spei_index(i,j,:)=ones(1,n-12)*NaN;
        end
    end
end

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2021-12-20

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1614780-function-doesnt-works-well#answer_859085

在 MATLAB Online 中打开

spei_index(i,j,:) = spei(t, prec(i,j,:), pevap(i,j,:), varargin{:} );

is my guess.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Nurul Ain Basirah Zakaria 2021-12-21

so it should be okay right if my data:

prec=98x56x420

pevap=98x56x420

and

t=1x420

Nurul Ain Basirah Zakaria 2021-12-21

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);

请先登录，再进行评论。

Answer 2

Rik 2021-12-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1614780-function-doesnt-works-well#answer_858945

在 MATLAB Online 中打开

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).