convert plot(x,y) to plot(y(ind))

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Muhannad
Muhannad 2015-6-24
评论： Muhannad 2015-6-24
Hi,
I am trying to convert plot(x,y) to plot(y(ind)) So i am interesting in getting the indices of x which gives me y?
Thanks,

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2015-6-24
编辑：Azzi Abdelmalek 2015-6-24
Just do this
plot(y)
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Azzi Abdelmalek
Azzi Abdelmalek 2015-6-24
x = cumsum(hann(100));
y = linspace(-1,1,100);
plot(x,y);
idx=1:10:100
set(gca,'xtick',x(idx))
nxt=arrayfun(@num2str,idx,'un',0)
set(gca,'xticklabel',nxt)
Muhannad
Muhannad 2015-6-24
can you show the final results in plot(y(ind))? as I need the indices and not the plot.

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Purushottama Rao
Purushottama Rao 2015-6-24
g=interp1(y,x,0.5)
g gives you the x value corresponding to the given y value (0.5).
Use a for loop to find out the entire range.
Hope this is what you are looking for
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Purushottama Rao
Purushottama Rao 2015-6-24
编辑：Purushottama Rao 2015-6-24
x = cumsum(hann(100));
y = linspace(-1,1,100);
plot(x,y);
for k=1:length(y)
g(k)=interp1(y,x,y(k));
end
The speed looks to be ok. Ofcourse i do not know whether you are using the same x and y or not.
Muhannad
Muhannad 2015-6-24
so can you include another plot(y(ind)) which will give me the same shape as plot(x,y) but the x axis will be different and it will include the indices?

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