create output structure within a function

Question

Mariska Kret 2011-7-1

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Hi,

I have problems getting the data output in a structure. I made a function in which I do several things. In the end, I want to have an output structure which contains different parts of the data.

this is how the script starts: function [output] = interpolate_csv (filename)

In the end I create the output like this: output = struct('pathstr','name','ext','baseline', 'postbaseline','postbaseline_baseline_corrected_0_500ms', 'postbaseline_baseline_corrected_500_1000ms', 'postbaseline_baseline_corrected_1000_1500ms', 'postbaseline_baseline_corrected_1500_2000ms', 'postbaseline_baseline_corrected_2000_2500ms', 'postbaseline_baseline_corrected_2500_3000ms', 'postbaseline_baseline_corrected_3000_3500ms', 'postbaseline_baseline_corrected_3500_4000ms')

All I get is this:

output =

''

What do I need to add to the script?

Thank you for your help.

best, Mariska

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Answer 1

Fangjun Jiang 2011-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/10688-create-output-structure-within-a-function#answer_14710

在 MATLAB Online 中打开

unless you mean this:

output = struct('pathstr','name','ext','baseline', 'postbaseline',{'postbaseline_baseline_corrected_0_500ms', 'postbaseline_baseline_corrected_500_1000ms', 'postbaseline_baseline_corrected_1000_1500ms', 'postbaseline_baseline_corrected_1500_2000ms', 'postbaseline_baseline_corrected_2000_2500ms', 'postbaseline_baseline_corrected_2500_3000ms', 'postbaseline_baseline_corrected_3000_3500ms', 'postbaseline_baseline_corrected_3500_4000ms'})
output = 
1x8 struct array with fields:
    pathstr
    ext
    postbaseline
>> output(1)
ans = 
           pathstr: 'name'
               ext: 'baseline'
      postbaseline: 'postbaseline_baseline_corrected_0_500ms'

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Mariska Kret 2011-7-1

Hi,

thanks for your answers and sorry for not making myself clear. I don't have much programming experience. Anyway, I did not forget to insert the data...I just don't know how to get it into the structure! :-)

I get all the outputvalues when I do it as below. But since I have more than one file, I need to make a loop. But first I want to learn how to make a neat data structure, preferably with the name of the csv-file and than in it all the things I now listed in the first line.

thank you for your help.

Mariska

function [pathstr, name, ext, baseline, postbaseline,postbaseline_baseline_corrected_0_500ms,postbaseline_baseline_corrected_500_1000ms,postbaseline_baseline_corrected_1000_1500ms,postbaseline_baseline_corrected_1500_2000ms,postbaseline_baseline_corrected_2000_2500ms,postbaseline_baseline_corrected_2500_3000ms,postbaseline_baseline_corrected_3000_3500ms,postbaseline_baseline_corrected_3500_4000ms] = interpolate_csv5 (filename)

% read csv file

data = csvread('test2.csv', 5); % read the file, skip first five lines

% filename as output

[pathstr, name, ext] = fileparts(filename)

% extreme values become missing (= NaN)

data_temp = data(:, [8 11]);

data_temp(data_temp >= 9) = NaN;

data_temp(data_temp < 1) = NaN;

data(:, [8 11]) = data_temp;

time = (1:length(data))'% time = data(:,1);

data_temp8 = data(:, 8);

data_temp11 = data(:, 11);

% interpolate NaNs with a certain max

%data_interpolated8 = interp1(time(isfinite(data_temp8)), data_temp8(isfinite(data_temp8)), time);

%data_interpolated11 = interp1(time(isfinite(data_temp11)), data_temp11(isfinite(data_temp11)), time);

data_interpolated8 = interp_nan(data_temp8, 4);

data_interpolated11 = interp_nan(data_temp8, 4);

% average colomn 8 and 11

averaged_filtered_data = (data_interpolated8 + data_interpolated11)/2

% postbaseline

postbaseline = averaged_filtered_data(data(:, 2) > 0)

% baseline

baseline = averaged_filtered_data(data(:,2) == 0);

baseline = baseline(end-4:end);

baseline = mean (baseline)

% postbaseline minus baseline

postbaseline_baseline_corrected = postbaseline - baseline

postbaseline_baseline_corrected_0_500ms = mean(postbaseline_baseline_corrected(1:30,1))

postbaseline_baseline_corrected_500_1000ms = mean(postbaseline_baseline_corrected(31:60,1))

postbaseline_baseline_corrected_1000_1500ms = mean(postbaseline_baseline_corrected(61:90,1))

postbaseline_baseline_corrected_1500_2000ms = mean(postbaseline_baseline_corrected(91:120,1))

postbaseline_baseline_corrected_2000_2500ms = mean(postbaseline_baseline_corrected(121:150,1))

postbaseline_baseline_corrected_2500_3000ms = mean(postbaseline_baseline_corrected(151:180,1))

postbaseline_baseline_corrected_3000_3500ms = mean(postbaseline_baseline_corrected(181:210,1))

postbaseline_baseline_corrected_3500_4000ms = mean(postbaseline_baseline_corrected(211:240,1))

end

Fangjun Jiang 2011-7-2

output=struct('postbaseline',[postbaseline_baseline_corrected_0_500ms,postbaseline_baseline_corrected_500_1000ms]);

or

output=struct('postbaseline',[postbaseline_baseline_corrected_0_500ms;postbaseline_baseline_corrected_500_1000ms])

Mariska Kret 2011-7-6

Thank you for the replies. I have it working now and also created a loop so that it saves data from multiple csv files.

data=struct('filename',filename,'baseline',baseline,'postbaseline',[postbaseline_baseline_corrected_0_500ms,postbaseline_baseline_corrected_500_1000ms...etc 3500_4000]);

I want to have an excel or csv file as output. This matrix should have the size of 10 columns (1 for filename, 1 for the baseline value, 8 different post-baseline values). Each unique .csv file should start on a new line.

xlswrite('filename',baseline,postbaseline);????

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Answer 2

Fangjun Jiang 2011-7-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/10688-create-output-structure-within-a-function#answer_14702

Do you mean

output=struct('pathstr',name,'ext',baseline,...)?

check the syntax of struct() again.

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Fangjun Jiang 2011-7-1

If I run your line directly, I got

??? Error using ==> struct

Field and value input arguments must come in pairs.

Check to make sure you always have the struct('param',value) with 'param' and value paired.

Jan 2011-7-1

@Mariska: You did not get Jiangs point. It looks like you define the STRUCT with only the field names, but forget to insert the data also. But the syntax of STRUCT is: struct(name1, data1, name2, data2, ...).

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