[scilab-Users] 500mo Ascii file

[Samuel Enibe]

Try this;

1. Let full name of file be myfile.csv

2. Read the entire file using the csv read function.
        mystring = read_csv(myfile);

3. Extract the header lines (lines 1 to 5 in the example) into a new
variable as follows:.

myheader = mystring(1:5,:);

4. Delete the header lines from the variable mystring using the command
mystring(1:5,:) = [];

5. Convert the remaining object into a numeric variable as follows:
mydata  = evstr(mystring).

6. Process the numeric data as usual.



I hope this helps.



Prof. Samuel Enibe
Department of Mechanical Engineering
University of Nigeria, Nsukka, Nigeria


-----Original Message-----

From: Tingsten

Sent:  09/06/2012 12.06.43 pm

Subject:  [scilab-Users] 500mo Ascii file



Hello everyone,



I have got a 500mo ascii file that I would like to post process with Scilab
(

5.3.3 or 5.4) and I am struggling a lot….

My file looks like that:



*Header

Test number 1, 05/06/2012

6 Channels at 50000Hz

Data starts here:

Time,CH1,CH2,CH3,CH4,CH5,CH6

-10.000019,-0.660920,-0.136021,-0.120244,1.206482,-0.201057,-0.040760,

-9.999999,-0.605067,-0.136021,-0.124390,1.151813,-0.126591,0.002605,

-9.999979,-0.584123,-0.140555,-0.128536,1.025510,-0.040956,0.027115,

………*



Cause of the header I can’t use straight csv_read (or I need to del
ete the

header first with a text editor and then use it. That works but is not very

“clean”) so I would like to do it only with scilab.



What I do (and that does not work…):



First I check where start the data and analyse the format:

/f=mopen(file,’r’);data=mgetl(f,10);mclose(f); =>work
s fine/



Then I increase the stacksize and read the entire file :

/stacksize(‘max’);f=mopen(file,’r’);data
=mgetl(f,-1);mclose(f);/ =>works

fine



Then I try to extract some of the data:

/[n,Time,CHX]=msscanf(-1,data(6:$),”%f,%f”)/ => crashes
 everytime (with

5.3.3 or 5.4)

But a

/[n,Time,CHX]=msscanf(-1,data(6:1000:$),”%f,%f”)/ => wo
rks fine (with 5.3.3

or 5.4)



Do you have some advice to open the whole file properly in scilab?

Thx you a lot for your help and have a great week-end.





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