Help me in finding mistake

I have made a function (having name preprocessing) and calling it by following command in Command Window.

preprocessing('C:\Users\Explorer\Documents\MATLAB\PhysioNet_Database\Malignant_Ventricular_Ectopy_Database\418m.mat')

But getting Error and here it is:

Error using upfirdn>validateinput (line 102)
The input signal X must be a double-precision vector.

Error in upfirdn (line 82)
[p,q] = validateinput(x,h,varargin);

Error in resample (line 119)
y = upfirdn(x,h,p,q);

Error in preprocessing (line 21)
r_nsr16265=resample(nsr16265,256,fs); % Resampling

By the way, if it asks for default sampling frequency, enter 250.

[Walter Roberson]

Well that's a broken website. :(

I have downloaded and attached the file so that no-one else needs to go through that... experience .

Answer 1

[Walter Roberson]

That routine does not accept file names.

filestruct = load('C:\Users\Explorer\Documents\MATLAB\PhysioNet_Database\Malignant_Ventricular_Ectopy_Database\418m.mat');
preprocessing(filestruct.x)

[Explorer]

I am still facing same error.

[Walter Roberson]

I have corrected my code.

[Explorer]

Now I am getting another error i.e Reference to non-existent field 'x'.

[Walter Roberson]

Please show the output of

whos('-f', 'C:\Users\Explorer\Documents\MATLAB\PhysioNet_Database\Malignant_Ventricular_Ectopy_Database\418m.mat')

[Explorer]

I not getting any output after entering the above line you stated.

[Walter Roberson]

whos('-file', 'C:\Users\Explorer\Documents\MATLAB\PhysioNet_Database\Malignant_Ventricular_Ectopy_Database\418m.mat')

If that does not work, then please use

clear all
load('C:\Users\Explorer\Documents\MATLAB\PhysioNet_Database\Malignant_Ventricular_Ectopy_Database\418m.mat')
whos

and show the output

[Explorer]

Output

[Walter Roberson]

You aren't happy with the answers you are getting from me, so I am dropping out of this discussion.

http://uk.mathworks.com/matlabcentral/answers/265965-how-to-make-a-function

[Explorer]

Sorry. Won't do it again.

[Explorer]

I got the answer in your last comment here i.e You need to load the .mat file and access the appropriate variable from the file

I just replaced line # 18 of function by this

 nsr16265=x.val(1,:);

Thank you!