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

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,

Answer 1

[Azzi Abdelmalek]

Just do this

plot(y)

[Muhannad]

That will not work... my plot is

x = cumsum(hann(100));
y = linspace(-1,1,100);
plot(x,y);

I want to make it plot(y(ind))?

[Azzi Abdelmalek]

Indices of x are from 1 to numel(x). Is this right?

[Muhannad]

Yes so the shape of the plot will be the same but the x axis will be different from 1 to 100.

[Muhannad]

plot(x,y) vs plot(y) is show in the attachment which is different from what I want. So what I want is plot(y(ind)) should look like plot(x,y) in other word I want the indices of y which will give me a plot similar in shape to plot(x,y).

Hope this is clear.

[Azzi Abdelmalek]

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]

can you show the final results in plot(y(ind))? as I need the indices and not the plot.

Answer 2

[Purushottama Rao]

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

[Muhannad]

I am not sure if I am implementing it right, but a for look will be very slow as I am computing this for many values.

[Purushottama Rao]

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]

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?