code for interp1 in matlab

To perform interpolation in Matlab, you can use the interp1 function.

The interp1 function can be used to interpolate a set of data values at specified query points, using various interpolation methods like linear, cubic or spline.

Here's a basic example of using interp1 in Matlab:

main.m
% Define a set of data points
x = [1, 2, 3, 4];
y = [2, 4, 1, 3];

% Query points for interpolation
xq = 1:0.1:4;

% Interpolate using linear method
yq = interp1(x, y, xq, 'linear');

% Plot original function and interpolated points
plot(x,y,'o',xq,yq,'-');
258 chars
13 lines

In this example, we define a set of 4 data points (1, 2), (2, 4), (3, 1), and (4, 3). We then specify query points xq from 1 to 4 in steps of 0.1. Using the interp1 function with the 'linear' method, we compute the interpolated values of yq at the xq query points. Finally, we plot the original data points and the interpolated values using the plot function.

You can experiment with different interpolation methods by changing the last argument of interp1 to 'cubic', 'spline', or other valid interpolation methods.