[scilab-Users] Re: 500mo Ascii file

[Antoine Monmayrant]

On 13/06/2012 09:24, Tingsten wrote:
> Hello Antoine,
>
> Thx you for your post.
> Indeed, I can give more detail about what I would like to achieve.
>
> As you can see in the first post that did includes the first lines of the
> file, I have a 6 channels recording (in fact 7 cause first column is time).
> First think I want to do is to verify that there is nothing "strange" on
> each channel. So I would like at least be able to load the time and 1
> channel (2 first columns) to do a plot. The "game" is to do it in an
> efficient way :
> without loading twice the data =>  what I do using mgetl + msscanf
> and without using an external software to delete the header
>
> If needed I can upload the first lines of the file?
> Thank you for help and have a great day,
> Rémi
Hi again,

Sorry I missed your first post.
 From what I've read, you're almost done:
> First I check where start the data and analyse the format:
> /f=mopen(file,’r’);data=mgetl(f,10);mclose(f); =>works fine/
 From here, you should have a look at data.
It should be a nlinesx1 matrix of strings from which you can strip the 
header and then evaluate the rest as a matrix definition:

//sample script that worked on the file you put in your first post

filename='/tmp/dat.csv';

f=mopen(filename,'r');
data=mgetl(f,10);
mclose(f);

// Getting rid of the 5 1st lines that corresponds to the header and 
converting to a matrix of double
// I assumed the file started at 'Test number ...': if it starts at 
'*Header, change 5 into 6

scan_dat=evstr(data(5:$,:));
clear data

T=scan_dat(:,1);
CH1=scan_dat(:,2);
CH2=scan_dat(:,3);
CH3=scan_dat(:,4);
CH4=scan_dat(:,5);
CH5=scan_dat(:,6);
CH6=scan_dat(:,7);

scf();
plot(T,CH1,'r');
plot(T,CH2,'k');

Hope it helps,

Antoine

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