Uniform Interpolation/resample Question

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Tsuwei Tan 2018-8-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415598-uniform-interpolation-resample-question

评论： Rik 2018-8-22

采纳的回答： KSSV

data.mat

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Please find the attachment data.mat

figure(1)
plot(exp_f2,exp_t2,'ro')
ylabel('Unifrom Time Step 2.5ms');xlabel('Hz');title('Mode 2 Exp data,fs=400Hz')

Here I have uniform time step 2.5ms on my y axis. But I need an uniform frequency step on my x axis like

f2_interp=linspace(exp_f2(1),exp_f2(end),400);
How can I interpolate or resample it?  Thanks!

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KSSV 2018-8-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415598-uniform-interpolation-resample-question#answer_333504

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% interpolation 
ti=linspace(min(exp_t2),max(exp_t2),400);
yi = interp1(exp_t2,exp_f2,ti) ;
plot(yi,ti)

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Tsuwei Tan 2018-8-22

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In your code, you make the exp_t2 which is already uniform step to be uniform again:

ti=linspace(min(exp_t2),max(exp_t2),400);

What I need is to make exp_f2 to be uniform:

f2=linspace(min(exp_f2),max(exp_f2),numel(exp_t2));

The output of "interp1" command doesn't have to be uniform, thanks!

Rik 2018-8-22

Now I'm really confused. You want to make a variable uniform that is already uniform? And if you already have the code to do that, what is your question? And to what code are you referring to as "your code"? I haven't posted any code in this thread, only you and KSSV have.

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