Use of Interp to Interpret Data from a Table

Hi,

I have a simple table (in the form of 2D array) in which I would like to setup as a function, i.e., @(x), to extract data from by interpolation.

For example:

a = [1 2; 2 3; 3 4]; % This is my table data

I want to be able to say fn(2) and would get the value of that by interpolating from the data in 'a.'

So what I would do is the following:

fn = @(x)interp(a(:,1),a(:,2),x); % Define my function

So 'fn' now is a function that represents the data in the array where its to be evaluated at 'x.' The function to output the value of the function from a(:,2).

The above setup is done in MATLAB but it gives the following error:

"Expected r to be integer-valued."

"validateattributes(r,{'numeric'},{'>=',1,'finite','integer','scalar'},'interp','r');"

How so? I appreciate your help.

Note: I already installed "Signal processing toolbox."

Answer 1

[Voss]

Use interp1 instead of interp.

[Walter Roberson]

You might also want to enable extrapolation in the interp1 call

[Mohammed Raslan]

Thank you @Voss and @Walter Roberson. Great comments.