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Adding variables from function to workplace - Output not working

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Kate
Kate on 10 Jun 2013
Hi there,
I'm trying to add the variables within this function to my workplace so that I can use them in subsequent functions. I don't quite understand why it isn't doing this (I've added it as an output in the function line). Any ideas?
Thanks a bunch!
function [site, numyr, year_start, year_end, years, sitedata]=call_up
%Loading in one site-year and appending data to single matrix for multiple
% years.
%load files
clc;
clear all;
pwd
fuf(pwd, 'detail')
fn=fuf(['/Users/katharynwoods/Documents/MATLAB/flux_sensitivity_analysis/flux_anom_scripts/flux_data/WSA/US-FR2/*daily*.mat'],'detail')
load(char(fn{1}))
%Extract variables names
pieces = regexp(fn, '\/', 'split');
p=pieces{1};
site = p{11};
q = regexp(site, '\.', 'split');
sitename = q{1};
numyr=length(fn);
year_start=str2num(q{2})
year_end=year_start+numyr-1
years=year_start:1:year_end;
fix years
v=([sitename,'.',int2str(years(1)),'.synth.daily.mat']);
eval(['load ' v])
y_tot=data_d;
clear v
for i=2:numyr
% Create file names to load
v=([sitename,'.',int2str(years(i)),'.synth.daily.mat']);
eval(['load ' v])
% Append data to full matrix
y_tot=[y_tot;data_d];
clear v
end
sitedata=y_tot;
%save
save sitedata
end

Accepted Answer

the cyclist
the cyclist on 10 Jun 2013
Edited: the cyclist on 10 Jun 2013
When you call the function from the workspace, do you include the output functions there as well, such as
[site, numyr, year_start, year_end, years, sitedata] = call_up
  5 Comments
the cyclist
the cyclist on 10 Jun 2013
There are multiple ways of getting lots of variables out of a function without needing to explicitly list them all. One way is to use the "varargout" functionality: http://www.mathworks.com/help/matlab/ref/varargout.html. Another would be to put the variables in a structure, and then output the structure. Another (but slow and probably dumb) way would be to write the variables to disk, and then load them from disk again. Another solution mentioned global variables, but as you point out, that is probably not going to work for you.

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More Answers (1)

Pourya Alinezhad
Pourya Alinezhad on 10 Jun 2013
Edited: Pourya Alinezhad on 10 Jun 2013
hi, well,we know that functions don't share variables with workspace,if you want to use variables in several functions you can declare them as GLOBAL variables in all functions.for example write "global x" in 2 functions and you will see that this variable is the same in both. you can also use "Persistence " to make the variable hold it's past value from function's last call.
bear in mind that if you return a variable from a function to workspace,the another function can't see them in workspace.
  2 Comments
Pourya Alinezhad
Pourya Alinezhad on 10 Jun 2013
so you can call the function with left hand variables available : like this : [out1,out2,out3,out4,out5,out6]=call_up;

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