Increase the interpolation increment

Hi,

I have data sets as .csv with x and y coordinates. The data are correct and I plot them. However, I need to increase the X increment since the data are too much to be read by a machine. Does anybody know how can I increase the increment? Now, the X increment is 0.01 (inorganized, less or more) I need to plot the same thing with less number of points without reduce the accuracy too much. increment of let's say 0.5. What should I do?

Thanks

Answer 1

[darova]

If you want to read every 5th point:

i = 1:5:length(x);
plot(x(i),y(i))

[Torkan]

Thanks Darova,

However, I just do not want to read every five point. I need to interpolate those data again with an increment of 0.5.

For example, consider we have a function y=x^2. we have 20 points with increment 1 between -10 to 10. Now, I want to increase this increment to 3 for example.

[darova]

What about spline or interpolation?

xnew = -10:3:10;
% xnew = linspace(-10,10,6);    % i like this variant more
ynew = spline(x,y,xnew);
% ynew = interp1(x,y,xnew);     % or linear interpolation

[darova]

Can you please accept the answer?

[John D'Errico]

I accepted it.

[darova]

♥