Syntax and code in function parameter for ~

Hello, I am new to Matlab and trying to understand the notation for the following code.

A function is created

function [sol, it_hist, ierr] = Newton(x,f,fdash,tol,parms)

When this function is being recalled in a driver, it uses the following notation. However, I am unsure which outputs of the function are being ignored.

[~, resids] = Newton(x,f,fd,tol,parms)

I assume the solution outputs 'sol' and 'it_hist' are the ones being ignored?

[Stephen23]

These were both easy to find using [a major internet search engine]:

https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-inputs.html>

https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html

Answer 1

[John D'Errico]

No. The function does NOT output sol and it_hist.

The ~ in position 1 tells MATLAB NOT to return the first argument. The second output is stuffed into the variable resids. (You called it that, not me.) So whatever was returned in it_hist is now in resids in the caller workspace.

The third argument is also dumped into the bit bucket, since you gave MALTAB no place to store it.