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# how can i increase the number of my data?

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Elias Unk on 21 Jul 2018
Edited: Elias Unk on 22 Jul 2018
Basically, i have a 1x200 .mat file, the 200 are the xs (from 0 to 200) and each x has a corresponding y value. The thing is i need my plot and data to be 1x400 from that 1x200, what is the best way to do that as the values must make sense and represent the original graphe with just more data .i just want to increase the # of data without having bad or inaccurate values.
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### Accepted Answer

Jan on 21 Jul 2018
It is not clear what you are asking for. Maybe one of these 2 idea help you:
1. Change the x values:
x = 1:10; % Some test data, use your original signal
y = rand(1, 10);
subplot(1,2,1);
plot(x, y);
subplot(1,2,2);
plot(x * 2, y); % Or what ever change you need in x
2. Interpolation:
xx = linspace(x(1), x(end), 2 * numel(x))
yy = interp1(x, y, xx)
plot(x, y, 'o');
hold on
plot(xx, yy, '+');
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Jan on 22 Jul 2018
As far as I understand, interp1 is the way to go.

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