Re: Setting Tic Marks

[Joe Koski]

on 7/28/05 6:43 PM, Paul Kienzle at address@hidden wrote:

> Try
> 
> xtics = [0,1000,2000,4000,8000,16000,20000]
> tics('x',xtics,int2str(xtics))
> 
> It works for me.
> 
> - Paul
Paul, et al,

We're closer, but not there yet. When I try

figure(ifig);
clg;
legend('off');
axis('auto');
title([in_file," - Power Spectrum - Welch"]);
xlabel("Frequency, Hz");
ylabel("Signal Amplitude, dB");
Pxt=10*log10(abs(Px'));
tic_array = [0:2000:20000];
tics('x',tic_array,int2str(tic_array));
axis([0,20000],'tic');
grid on;
plot(w,Pxt);

gnuplot/aquaterm tries, but the x axis values are offset to the left (see
attachment), and no tics or grid appear. The posibilities are 1) I'm doing
something stupid, 2) there's a bug (could be mine), or 3) there's a better
way. Any ideas? I've tried moving the last axis statement around with and
without the 'tic' to no avail.

This isn't urgent, but what I'm trying to do is place an x scale so that
it's easier to pick the frequencies at which the peaks occur. The
axis('auto') scale is 5000, and it's difficult to estimate the frequencies
associated with the peaks.

Joe

> 
> On Jul 28, 2005, at 7:11 PM, Joe Koski wrote:
> 
>> I'm trying to manually set tic marks on a plot. According to "help
>> tics,"
>> the tics function has the form:
>> 
>>   tics(axis,[pos1,pos2,...],['lab1';'lab2';...])
>> 
>> Rather than typing a long array of pos1,pos2,pos3,..., I would prefer
>> to
>> define a vector, and then pass it to tics, but I can't seem to find the
>> correct format. What I have tried is:
>> 
>> figure(ifig);
>> clg;
>> legend('off');
>> axis('auto');
>> title([in_file," - Power Spectrum - Welch"]);
>> xlabel("Frequency, Hz");
>> ylabel("Signal Amplitude, dB");
>> Pxt=10*log10(abs(Px'));
>> axis([0,20000]);
>> tic_array = int2str([0:1000:20000])
>> tics(x,tic_array);
>> grid on;
>> plot(w,Pxt);
>> 
>> where tic_array is a character string with the correct values, but with
>> space, not comma, delimiters. Without the commas, I get an error
>> message.
>> 
>> Is there a simple way to convert a vector into something usable by
>> "tics?"
>> 
>> Thanks,
>> 
>> Joe
>> 
>> 
>> 
>> 
>> 
>> 
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> 
> 
> 
> -------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
> 
> Octave's home on the web:  http://www.octave.org
> How to fund new projects:  http://www.octave.org/funding.html
> Subscription information:  http://www.octave.org/archive.html
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