plot multiple points in multiple colors

 I am trying to plot the peaks and their harmonics. Figure 5 plots the peaks between 0-135 Hz and figure 6 plots the peaks and their harmonics between the normal frequency range i.e. 0-2000 Hz.
The first part of Figure 6 plots normal graph between freq_s(0-2000 Hz) and Signal_fft_hilbert. I want to plot xx2 peaks on this plot. I am not able to draw this plot. I want to mark these points in different colors for each 'k'.Also I am getting error with regards to size of freq_s and xx2. Can somebody suggest anything?

          figure(5)
          ind = (freq_s>=0 & freq_s<= 135); %// logical index to select desired range
          [peaks, locs] = findpeaks(abs(Signal_fft_hilbert(ind)))
          plot(freq_s(locs),abs(Signal_fft_hilbert(locs)))
          hold on
          plot(freq_s(locs),peaks,'*g')
          for k=1:length(peaks)
              z=z+1;
              top1{k}=freq_s(locs(k));
              for s1=1:length(peaks)
                  xx{s1}=top1{k}*s1;
              end
              [xx1]=[xx(:)]  
              xx2=cell2mat(xx1);
              figure(6)
              plot(freq_s(2:250),abs(Signal_fft_hilbert(2:250)))
              hold on
              plot(freq_s,xx2,'*g')
         end

[Patrik Ek]

Could be good to submit the error message here. Are freq_s and xx2 of the same size?

[ankita]

No they are of different size. But how should i take the freq_s to plot the xx2 points?

[Patrik Ek]

You must have two vectors of the same size when using plot. Try to filter the point you need from each vector and make sure to have the same size of them.

[Muhammad Imran]

If the data is of differrent in dependenta variable and you wish to plot in same figure you can use command (plotyy)

Answer 1

[Paul]

col=1:numel(peaks);
scatter(freq_s(locs),peaks,[],col)

You can specify the size of the circles where [] is. Im not sure what xx2 is supposed to be. But if you want to plot that replace peaks with xx2.