Import data with textscan that is non-periodic

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I need to import some datas from a file that is structured as follow:
Time1 (X11 Y11 Z11) (X12 Y12 Z12) ... (X1n Y1n Z1n)
Time2 (X21 Y21 Z21) (X22 Y22 Z22) ... (X2n Y2n Z2n)
Time_m (Xm1 Ym1 Zm1) (Xm2 Ym2 Zm2) ... (Xmn Ymn Zmn)
I would like to obtain a Time vector and 3 matrix X Y Z.
I've tried with textscan but the Time at the beginning gives me some problems: if I use as formatSpec '%f (%f %f %f)' it only reads the first 4 numbers, on the other hand if I use '(%f %f %f)' it does read anything.
I've managed to solve this in an horrible way:
for i=1:nprobes
formatSpec=strcat(formatSpec,' (%f %f %f) ');
This way I create a 3*N + 1 cell array that i need to merge as:
but i don't know how to do it (since N is very big)...
Can you please help?
Luca Amerio
Luca Amerio on 22 Mar 2013
Thank you so much. I'll try with the method you told me.

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Accepted Answer

Walter Roberson
Walter Roberson on 28 Feb 2013
Edited: Walter Roberson on 28 Feb 2013
formatSpec = ['%f', repmat('(%f %f %f)', 1, nprobes) ]
or, use repmat('%f', 1, nprobes*3+1) as the format and use ' ()' as the Delimiter with MultipleDelimsAsOne set true.

More Answers (1)

Cedric Wannaz
Cedric Wannaz on 28 Feb 2013
Edited: Cedric Wannaz on 28 Feb 2013
Just for the merge, without talking about improving the overall approach, you can do
X = [data{2:3:3*N-1}] ;
Y = [data{3:3:3*N}] ;
Z = [data{4:3:3*N+1}] ;


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