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[Octave-bug-tracker] [bug #53220] Sending strings to quadl

From: Rik
Subject: [Octave-bug-tracker] [bug #53220] Sending strings to quadl
Date: Tue, 27 Feb 2018 10:56:30 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

Follow-up Comment #3, bug #53220 (project octave):

The quad error message is different because it can actually accept raw code to
execute, rather than the documented first argument for all the other quad

F is a function handle, inline function, or string containing the
name of the function to evaluate

For example,

quad ("x.^2 + 1", 0, 2)
warning: quad: passing function body as a string is obsolete; please use
anonymous functions
ans =  1.3333

Try the same thing with quadl and you get 

quadl ("x.^2 + 1", 0, 2)
error: feval: function 'x.^2 + 1' not found

because it recognizes that the double-quoted object is a string, and therefore
should be the name of a function.

Accordingly, you can either give it a function handle, inline function, or
name of a function that calculates what you want.

octave:5> function y = MYF (x)
> y = x.^2 + 1;
> endfunction
octave:6> quadl ("MYF", 0, 1)
ans =  1.3333
octave:7> quadl (@(x) x.^2 + 1, 0, 1)
ans =  1.3333
octave:8> quadl (inline ("x.^2 + 1"), 0, 1)
ans =  1.3333


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