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## Function names in feval

**From**: |
Dirk Laurie |

**Subject**: |
Function names in feval |

**Date**: |
Wed, 22 Mar 2000 10:17:09 +0200 (SAST) |

In the following Octave code (2.0.14):
function y=integ(f,a,b,n)
h=(b-a)/n; x=a+h*(0.5:n);
y=h*sum(feval(f,x));
endfunction
the string 'f' may not contain the name of any local variable.
I.e. if I have coded
function y=f(x)
y=exp(sin(x));
endfunction
it is illegal to ask for
integ('f', 0, 2*pi, 16)
This means I have to do one of the following:
(a) use local variables with names like f_, h_ etc and tell
my user not to use such names. Problem: if his routine,
in turn, has a function argument, he has to think up
another convention for his own local variables, etc.
(b) make a list of all local variables and tell my user those
are illegal.
Neither is very satisfactory. However, this must be a common
problem which must by now have a satisfactory solution.
I'm looking for one of the following answers:
(a) "Set THE_RIGHT_GLOBAL_VARIABLE to 1 and it will ignore
local variables for feval."
(b) "Install 2.0.16, in which this problem has been fixed."
(c) "This is a standard situation, which must be handled as
follows..."
Dirk Laurie
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**Function names in feval**,
*Dirk Laurie* **<=**