How to plot non equally spaced data in an equally spaced fashion and lable Xaxis with the data

Hi all，

I am trying to plot three variable on the double Y axis, I set "frequency" as X axis; "Tvalue" as left Y axis; "correlation" as right Y axis.I want to plot "correlation" as bar plot,Tvalue as line plot.

figure(1)
[hAxes,hBar,hLine]=plotyy(freq,T,freq,correlation,'bar','plot');%%
set(hLine,'color',[0,0,1],'LineWidth',1,'Marker','o','MarkerSize',2,...
    'MarkerFace','y')
set(hAxes(1),'ylim',[-3 6]) 
set(hAxes(2),'ylim',[0 0.5]) 
set(hAxes(1),'yTick',[-3:1:6]);
set(hAxes(2),'yTick',[0:0.1:0.5]);
set(gca,'XTick',[0:0.05:1]);
xlabel('Frequency')
ylabel(hAxes(1),'Tvalue')
ylabel(hAxes(2),'correlation')

The problem I am facing is that I cannot plot the data in an equally-spaced plot . This is what I have now:

Answer 1

[KSSV]

Read about interp1. USe interpolation and make the data even. Let F, T be your column data.

m = length(F) ; 
Fi = linspace(min(F),max(F),m) ;
Ti = interp1(F,T,Fi) ;
plot(Fi,Ti)

[楠 赵]

Thanks! Those lines works for me. I got this figure:But how can I lable all the X axis with the value of "freq"?

[KSSV]

Read about xlabel and ylabel.

[楠 赵]

Sorry, I mean how to present XTick with all the value of "freq",like this: I use set to set X axis,but it not works for me

[KSSV]

Use xticks. Also read about xticklabels.

[楠 赵]

Sorry, I still cannot figur out how to use xticks to present data from"freq".

freq=1./(period/10);

freq=freq(1,29:108);

freq_l = 1:length(freq);

figure(2)

Ti = T(numch,:);

Ci = coher_mt(numch,:);

%Fi = linspace(min(freq),max(freq),m) ;

%Ti = interp1(freq,T(numch,:),Fi) ;

%Ci = interp1(freq,coher_mt(numch,:),Fi) ;

[hAxes,hLine1,hLine2]=plotyy(freq_l,Ti,freq_l,Ci,'plot','stem');%%

set(hLine2,'LineWidth',1,'Marker','o','MarkerSize',2,...

'MarkerFace','y')

set(hLine1,'LineWidth',1,'Marker','o','MarkerSize',2)

set(hAxes(1),'ylim',[-3 6],'yTick',[-3:1:6])

set(hAxes(2),'ylim',[0 0.5],'yTick',[0:0.1:0.5])

this is what I have now: