[Tcl-bugs] [ tcl-Bugs-1273713 ] Expr with acos

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Bugs item #1273713, was opened at 2005-08-25 21:38
Message generated for change (Comment added) made by msofer
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Category: 16. Commands A-H
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Alvin Leung (alvinpleung)
Assigned to: Donal K. Fellows (dkf)
Summary: Expr with acos

Initial Comment:
set factor2 [expr ($x0x1 - $y1_sqrt_factor1) *
$denominator]
[expr acos($factor2)]
works
set factor2 [expr acos(($x0x1 - $y1_sqrt_factor1) *
$denominator)]
failed with error message
domain error: argument not in valid range




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>Comment By: miguel sofer (msofer)
Date: 2005-08-25 22:13

Message:
Logged In: YES 
user_id=148712

Can you provide a complete session log, including the values
of your variables? Are you sure that they have the same
values in both cases? The error message indicates that (Tcl
thinks that) the argument to 'acos' is not between -1 and 1 

% set a 2
2
% set b 1
1
% set c 0.5
0.5
% set f [expr acos(($a-$b)*$c)]
1.0471975512
% set c 2
2
% set f [expr acos(($a-$b)*$c)]
domain error: argument not in valid range


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