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Dear Forum,

I don't understand why the following does not work.

(Gap 3.4 on a Sun under SunOS or a PC under Linux 2.0).

gap> tt:=function(infile) > local A; > Read(infile); > return A; > end; gap> Read("c"); gap> A; 10 gap> gap> tt("c"); Error, Variable: 'A' must have a value at return A ... in tt( "c" ) called from main loop brk> brk> return; gap> Read("c"); gap> A; 10 gap>

I don't see why A:=10 is not executed inside the function.

Or, rather, why the evaluation of A is somehow delayed (?)

I tried to change Read into READ and see if it reports "true" - it does...

the file "c" is as follows (just one line). #-------------------------- A:=10;; #---------------

Many thanks in advance,

Dima

PS. This happened when I tried to Exec something producing a

GAP-readable file and then Read it there, all within a function.

What would be the alternative to what I'm trying to do?

Dmitrii V. Pasechnik

Department of Mathematics

Eindhoven University of Technology

PO Box 513, 5600 MB Eindhoven

The Netherlands

e-mail: dima@win.tue.nl

http://www.can.nl/~pasec

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