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To answer my own question, this works.<BR>
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\def\test#1{\FPifzero{#1} 0 \else \testp{#1} \fi}<BR>\def\testp#1{\FPifpos{#1} 1 \else -1 \fi}<BR><BR>It looks like FP has trouble with nested tests.<BR>
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From: chessfan123@hotmail.com<BR>To: pstricks@tug.org<BR>Date: Wed, 18 Jun 2008 07:19:21 +0000<BR>Subject: Re: [pstricks] Testing a number<BR><BR>
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Herbert<BR><BR>> Date: Wed, 18 Jun 2008 08:47:23 +0200<BR>> From: Herbert.Voss@FU-Berlin.DE<BR>> To: pstricks@tug.org<BR>> Subject: Re: [pstricks] Testing a number<BR>> <BR>> John Smith schrieb:<BR>> > Is there a way to test is a number is zero, positive or negative? I tried this using the FP package as follows.<BR>> > <BR>> > \def\test#1{\FPifzero{#1} 0 \else \FPifpos{#1} 1 \else -1 \fi \fi}<BR>> > <BR>> > It works if the number is positive or negative but gives a Tex error about an extra \fi if the input is zero.<BR>> <BR>> giv an example in which case do you need such a test.<BR> <BR>I want the macro to return numbers as follows.<BR> <BR>\test{0} -> 0<BR>\test{1.234} -> 1<BR>\test{-1.234} -> -1<BR> <BR>I need to know the sign of the number because it influences whether I draw a vector (if number is not equal to zero) and in which direction it points.<BR> <BR>Thanks.<BR><BR>
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