Syntax and code in function parameter for ~

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Emma Humphrey
Emma Humphrey 2018-9-22
评论： Stephen23 2018-9-23
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?
  1 个评论
Stephen23
Stephen23 2018-9-23
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

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John D'Errico
John D'Errico 2018-9-22
编辑：John D'Errico 2018-9-22
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.

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