Re: How to plot two graphs with a textfile with a textdocument with two x two columns?

[Macy]

Not sure I understood your 'total' problem.

If it's not too difficult to remove that pesky text header, or better yet, 
change the source to write the files' headers to make them octave compatible.

If stuck with useless header, take the first file, open it with a text editor, 
remove everything but the data, then save as A.txt and the other as B.txt
then
>> load -force A.txt;load -force B.txt;
>> tA=A(:,1)': A=A(:,2)';
>> tB=B(:,1)'; B=B(:,2)';
then plot appropriately

I use:
>> plot(tA, A);
>> hold on; plot(tB, B); hold off;
that way you overlay them

but tA is always tB then throw away and just use t.
>> t=A(:,1)';

for interesting effect you can also 
>> plot(log10(t/tref), 20*log10(A) );
where tref 'marks' itself at 0 on your plot.



--- address@hidden wrote:

From: Conrad Kopernikus <address@hidden>
To: address@hidden
Subject: How to plot two graphs with a textfile with a textdocument with two    
x two columns?
Date: Fri, 14 Mar 2014 14:42:05 -0700 (PDT)

Dear Community,

with some physic experiments with picoscope I get a textfile (.txt) with two
columns. But I have to graphs. My textfile look a littlebit like that:

Channel A
Time     Value
(ms)    (mV)
3       6305
19      6178
34      6081
50      5905
66      5758
81      5641
97      5592
112     5573

Channel B
Time     Value
(ms)    (mV)
3       8864
19      8796
34      8786
50      8786
66      8816
81      8786
97      8786
112     8737

The columns are larger in reality. But how to plot that? I delete the text
and copy the columns for the first graph in a new text-file and the second
in a new text-file. I load both textfiles use the x1=(:,1) and get a plot
like: plot(x1,y1,x2,y2). That works. But is their a faster way to do that?
Can I just use one and same textfile ... but just say to octave it should
make to graphs instead of connecting them?

Please, I need help :-)

Greatful regards,
Conrad



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