Does it make sense to Resample and interpolate?

I am working with two different datasets that I need to compare

Data 1: 399x2 array with a sampling rate of Fs=4 Hz

Data 2: 9237x19 array with a sampling rate of Fs=10 Hz

• Firstly I would like to downsample Data 2, so I have an Fs=4 Hz for both signals.
• I would like to compare some properties and plot the two datasets together - I need the same length of points in the x-axis and need to interpolate.

My question is whether the order is important?

Is it faulty to use both? I suppose I am downsampling twice?

% Downsampling

T1 = 0.1; Fs = 1/T1;

y1 = resample(b, 4, 10);

Ty1 = T1 / (4/ 10); %sampling frequency of 2.5

ty1 = (0:length(y1)-1)*Ty1; % new vector with 4Hz (= 0.250s samplingsrate)

% Interpolate

Tx1 = 1:1:399

A31=interp1( ty1 , y1,Tx1)

Thanks!

[Mathieu NOE]

hello

even if both data sets would have the same sampling frequency (why is it so important BTW ? )

their time duration are differents , so how do you want to plot the two in the same graph ? of course it's doable but each dataset will have a different time vector, so why bother with resampling ?