# How to remove values from a data set to make it a specific length?

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Alfredo Scigliani on 20 Apr 2022
Commented: Dyuman Joshi on 30 Oct 2023
I will explain myself better:
If I have
xdata = [ 1 2 3 4 5 6 7 8 ]
ydata = [ 1 2 3 4 5 6 ]
if I want to plot(xdata,ydata) it will say that the vectors must be the same length and I cannot plot it. Instead of going to my specific data set and manually deleting values, I would like xdata to have the same length as ydata. Somehow deleting those values, making them = [ ], so that both of them have the same length.
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Voss on 30 Oct 2023
xdata = [ 1 2 3 4 5 6 7 8 ];
ydata = [ 1 2 3 4 5 6 ];
% n is the minimum of {number of elements in xdata, number of elements in ydata}
n = min(numel(xdata),numel(ydata));
xdata_new = xdata(1:n);
ydata_new = ydata(1:n);
Dyuman Joshi on 30 Oct 2023
@Suuz Schouten, if you go through Voss's answer below, you will find the logic (and implementation as well) for that.

Voss on 20 Apr 2022
If that's what you want to do
xdata = [ 1 2 3 4 5 6 7 8 ];
ydata = [ 1 2 3 4 5 6 ];
% n is the minimum of {number of elements in xdata, number of elements in ydata}
n = min(numel(xdata),numel(ydata));
% plot the first n elements of ydata vs the first n elements of xdata
plot(xdata(1:n),ydata(1:n))
Alfredo Scigliani on 20 Apr 2022
that works too!

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