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From: McLaren on 21 Apr 2010 12:49
Hello,

I am running cycles of data that run into the 100000s and will soon get to 10^6, and I would like to plot the hysteresis loops for the loops 1,10,100,1000,10000,99996, for whivh I have to use the indices index1, index10, index1000, index100000 and index99996; there are 29 data points in each loop hence plotting from index X to index X + 29.

for i=0:5
if i < 5
eval('plot(depMTSc(index' num2str(10^i) '):index(' num2str(10^i+29) '),FMTSc(index' num2str(10^i) ':index' num2str(10^i+29) ')');
end
if i==5
plot(depMTSc(index99996:index99996+29),FMTSc(index99996:index99996+29))
end
end

ideas?
From: Rune Allnor on 21 Apr 2010 12:54
On 21 apr, 18:49, "McLaren " <mclaren_a...(a)hotmail.com> wrote:
> Hello,
>
> I am running cycles of data that run into the 100000s and will soon get to 10^6, and I would like to plot the hysteresis loops for the loops 1,10,100,1000,10000,99996, for whivh I have to use the indices index1, index10, index1000, index100000 and index99996; there are 29 data points in each loop hence plotting from index X to index X + 29.
>
> for i=0:5
>     if i < 5
>         eval('plot(depMTSc(index' num2str(10^i) '):index(' num2str(10^i+29) '),FMTSc(index' num2str(10^i) ':index' num2str(10^i+29) ')');
>     end    
>     if i==5
>         plot(depMTSc(index99996:index99996+29),FMTSc(index99996:index99996+29))
>     end
> end
>
> ideas?

Instead of encoding the ranges in variable names,
use a table of indexes. The general idea goes like

indexvec = [1,30,60];
for n = 1:3
plot(x(indexvec(n):indexvec(n+1)-1));
end

Rune
From: us on 21 Apr 2010 13:35
"McLaren " <mclaren_alex(a)hotmail.com> wrote in message <hqnaa1$4d4$1(a)fred.mathworks.com>...
> Hello,
>
> I am running cycles of data that run into the 100000s and will soon get to 10^6, and I would like to plot the hysteresis loops for the loops 1,10,100,1000,10000,99996, for whivh I have to use the indices index1, index10, index1000, index100000 and index99996; there are 29 data points in each loop hence plotting from index X to index X + 29.
>
> for i=0:5
> if i < 5
> eval('plot(depMTSc(index' num2str(10^i) '):index(' num2str(10^i+29) '),FMTSc(index' num2str(10^i) ':index' num2str(10^i+29) ')');
> end
> if i==5
> plot(depMTSc(index99996:index99996+29),FMTSc(index99996:index99996+29))
> end
> end
>
> ideas?

yes...
first of all:

http://matlabwiki.mathworks.com/MATLAB_FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

now...

% the data
clear ix*; % save old stuff(!)...
ix100=-100;
ix1=1;
ix2=-2;
ix3=3;
ix10=-10;
ix11=-11;
ix12=12;
ix8=8;
% the engine
% - do this once
% get indices of sorted names...
save(fnam,'ix*');
s=load(fnam);
% the tedious part...
fn=fieldnames(s);
fn=regexp(fn,'\d+','match');
fn=[fn{:}];
fn=cellfun(@(x) sscanf(x,'%d'),fn);
[fx,fx]=sort(fn);
s=struct2cell(s);
s=cat(1,s{:});
s=s(fx);
% the result
% - an easily index-able vec...
disp(s);
%{
1 % <- ix1
-2 % <- ix2
3 % <- ...
8
-10
-11
12
-100
%}

us
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