Creating *.mat file from Python without using dictionary

Question

I have few lists which i want to save it to a *.mat file. But according to scipy.io.savemat command documentation i Need to create a dictionary with the lists and then use the command to save it to a *.mat file.

If i save it according to the way mentioned in the docs the mat file will have structure with variables as the Arrays which i used in the dictionary. Now i have a Problem here, I have another program (which is not editable) will use the mat files and load them to plot some Graphs from the data. The program cannot process the structure because it is written in a way where if it loads a mat files and then it will directly process the Arrays in it.

So is there a way to save the mat file without using dictionaries? Please see the Image for more understanding

Thanks

This is the sample algorithm i used to save my *.mat file

import os
os.getcwd()
os.chdir(os.getcwd())
import scipy.io as sio

x=[1,2,3,4,5]
y=[234,5445,778] #can be 1000 lists

data={}

data['x']=x
data['y']=y
sio.savemat('test.mat',{'interpolated_data':data})

Don't you simply need a dictionary where keys (which will be names after loaded in MATLAB) corresponds with names expected in this non-editable program? — Łukasz Rogalski
– Łukasz Rogalski, Commented Jun 14, 2017 at 11:14
@ŁukaszRogalski I did not understand what you mean exactly. Can you explain it a bit more — ayaan
– ayaan, Commented Jun 14, 2017 at 11:21
can you add an example of the code that calls scipy.io.savemat? it seems like you are abusing this function... — Shai
– Shai, Commented Jun 14, 2017 at 11:35

Shai · Accepted Answer · 2017-06-14 11:48:25Z

2

How about

scipy.io.savemat('interpolated_data_max_compare.mat', 
                 {'NA1_X_order10_ACCE_ms2': np.zeros((3000,1)),
                  'NA1_X_order10_DISP_mm': np.ones((3000,1))})

Should work fine...

According to the code you added in your question, instead of sio.savemat('...', {'interpolated_data':data}), just save

sio.savemat('...', data)

and you should be fine: data is already a dictionary you don't need to add an extra level with {'interpolated_data': data} when saving.

edited Jun 14, 2017 at 11:48

answered Jun 14, 2017 at 11:37

Shai

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1 Comment

ayaan Over a year ago

If i have many lists how you would you suggest me to write the command?

xvan · Accepted Answer · 2017-06-14 12:32:45Z

1

You could use the Writing primitives directly

import scipy.io.matlab as ml

f=open("something.mat","wb")
mw=ml.mio5.MatFile5Writer(f)
mw.put_variables({"testVar":22})

edited Jun 14, 2017 at 12:32

answered Jun 14, 2017 at 12:08

xvan

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3 Comments

Shai Over a year ago

shouldn't f be open for write (and binary?). what is s? should it be f?

Shai Over a year ago

can you add a link do a documentation of ml.mio5? is it possible it's simply the backend of scipy.io.savemat?

xvan Over a year ago

Yes and yes, it's the backend, scipy.io.matlab.mio5 referenced at the end of savemat help.

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