Does findpeaks work with mat files?

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Fran 2019-7-5

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评论： Star Strider 2019-7-6

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Hi there

I have a very simple question. Does findpeaks work with matfile variables?

I run the following example below and I don't get any errors but my script doesn't detect any peaks. Essentially nothing happens if I run the following.

EPSCs_PYR_1= load('mytrace2131soma&syns.mat', 'mytrace2131syns');
EPSCs_PYR = mytrace2131syns(:,2);
time=mytrace2131syns(:,1);
findpeaks(EPSCs_PYR,time);

What do I do wrong? Similar scripts have worked in the past if I load .dat or .txt files

thank you!

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Stephen23 2019-7-5

编辑：Stephen23 2019-7-5

You load the .mat file into a structure named EPSCs_PYR_1, but you never actually use EPSCs_PYR_1 for anything or refer to it again. Whatever data is imported from that file is ignored by your code.

Fran 2019-7-5

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Hello

that's a good point I will investigate, however it is not entirely true that the variable imported (mytrace2131syns) is ingnored by my code because I can plot this variable just fine using the script below. It is the peak detection that doesn't work on these data.

EPSCs_PYR_1= load('mytrace2131soma&syns.mat', 'mytrace2131syns');
EPSCs_PYR = mytrace2131syns(:,2);
time=mytrace2131syns(:,1);
findpeaks(EPSCs_PYR,time);
plot(time,EPSCs_PYR);

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Stephen23 2019-7-5

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编辑：Stephen23 2019-7-5

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Most likely you need to actually refer to the structure that you imported the file data into:

S = load('mytrace2131soma&syns.mat', 'mytrace2131syns');
T = S.mytrace2131syns(:,1);
V = S.mytrace2131syns(:,2);
pks = findpeaks(V,T)

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Fran 2019-7-5

thanks, that looks more correct than what I did previously, however it produces the same output. The script plots my trace but the peakdetection on the trace doesn't work.

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Star Strider 2019-7-5

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‘... my script doesn't plot my trace and doesn't detect any peaks ...’

You are overwriting the findpeaks plot.

Try this instead:

figure
findpeaks(EPSCs_PYR,time);
figure
plot(time,EPSCs_PYR);

Both plots should now appear in their respective figure objects.

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Fran 2019-7-6

编辑：Fran 2019-7-6

I installed R2019a but our administator hasn't send me the licenses to update my matlab server yet, thus the R2019a is too new for my existing license files. I am now installing R2018b for the next month or so, at least until I update the server. I will let you know how it goes!

PS: in terms of updates, following your instructions everything appeared to be up-to-date in my previous 2017 version.