Resample frequency of an ECG signal

Hey! I need to upsample ECG signals from 250hz to 1000hz. I used the given code but it's dividing my 10 sec signal to 2.5 sec (1 signal to 4 rows) retaining the same sample i.e 2500. I want to keep the duration of ECG signal 10 sec.

originalFs = 250;

desiredFs = 1000;

[p,q] = rat(desiredFs / originalFs)

y = load('chf01m.mat')

y = resample(y.val,p,q);

t= 1:length(y)

Ty = t./desiredFs

plot(Ty,y(1,:));

kindly tell me what I am missing here.

[Mathieu NOE]

hello

As the two sampling frequency are related with factor 4 , I would simply use interpolation instead of resampling

so if x = original time vector , create new time vector xx with 4 times smaller time increments and do

yy = interp1(x,y,xx);

[sania urooj]

thanks @Mathieu NOE I got it.