How to pass a variable from one function into another using MatLab?

Question

Let's say I have some function import_data() and inside of this function I am creating 2 variables: response_values and file_to_get

file_to_get = uigetfile({'*.csv*'}, 'Select the CSV File',...
'\\pfile01thn\bbruffey$\My Documents\analysis data\full files\...
Raw Stats Data full file only');

response_values = zeros(numel(C),numCols);
for i=1:numel(C)
    v = textscan(C{i}, '%s', 'Delimiter',',');
    v = str2double(v{1}(4:end));
    response_values(i,1:numel(v)) = v;
end

I then need these variables passed into another function MS_Banding_Streaking()

How could this be done? (I'm using globals at the moment which is extremely bad practice.

Unless I misunderstood the question, can't you just assign the variables you want as the outputs of input_data() and then pass them to MS_Banding_Streaking in the standard way as in my answer? — jmetz
– jmetz, Commented Aug 2, 2012 at 18:25

jmetz · Accepted Answer · 2012-08-02 19:08:39Z

2

Something like

file import_data.m

function response_values, file_to_get = import_data()

file_to_get = uigetfile({'*.csv*'}, 'Select the CSV File',...
'\\pfile01thn\bbruffey$\My Documents\analysis data\full files\...
Raw  Stats Data full file only');

response_values = zeros(numel(C),numCols);
for i=1:numel(C)
    v = textscan(C{i}, '%s', 'Delimiter',',');
    v = str2double(v{1}(4:end));
    response_values(i,1:numel(v)) = v;
end

file mainfunc.m

% Stuff before
[vals, filegot] = import_data()
MS_Banding_Streaking(filegot, vals)
% Stuff after

edited Aug 2, 2012 at 19:08

answered Aug 2, 2012 at 18:21

jmetz

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3 Comments

jmetz Over a year ago

@BenB.: ins was a generic variable name in case your import_data function was to take inputs... if you don't need it just remove it, i.e. function response_values, file_to_get = import_data() ...

Ben B. Over a year ago

oh okay, i do have options that i have implemented for plotting but I'd remmoved them thinking i needed this haha. okay

jmetz Over a year ago

@BenB. - I modified my code to reflect the fact that you didn't need any inputs to input_data

chaohuang · Accepted Answer · 2012-08-02 18:37:11Z

1

Just simply write the two functions in the same .m file

function import_data()    
file_to_get = uigetfile({'*.csv*'}, 'Select the CSV File',...
'\\pfile01thn\bbruffey$\My Documents\analysis data\full files\...
Raw  Stats Data full file only');

response_values = zeros(numel(C),numCols);
for i=1:numel(C)
    v = textscan(C{i}, '%s', 'Delimiter',',');
    v = str2double(v{1}(4:end));
    response_values(i,1:numel(v)) = v;
end

MS_Banding_Streaking(response_values, file_to_get);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function MS_Banding_Streaking(resp_value, f2g)
% function body

answered Aug 2, 2012 at 18:37

chaohuang

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6 Comments

Ben B. Over a year ago

So since the function import_data() is creating the variable response_values if i understand your example correctly, i should just be able to add it in MS_Banding_Streaking(response_values) and it should work. Right now running my code this way it is telling me that the variable response_values is undefined.

chaohuang Over a year ago

@BenB. You should call MS_Banding_Streaking inside import_data since response_values is created within import_data

jmetz Over a year ago

Note though that doing this this way means that you can't call MS_Banding_Streaking from anywhere other than this file.

Ben B. Over a year ago

That's the issue I see with this, since i have a main function that is calling both import_data() and MS_Banding_Streaking()

chaohuang Over a year ago

@BenB. actually you can put the MS_Banding_Streaking function in a seperate file, as long as it's in the same directory as the main function file and the import_data() file, you should be able to call it in both main function and the import_data().

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