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Annoyances...how about this one? [message #12823]

Tue, 08 September 1998 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

Try this:

window
for i=0,500 do plots,[i,i,i],[300,301,302],/device,psym=3

On my platform {alpha OSF unix 5.1 Apr 13 1998}, this does
*not* draw all the pixels that should be filled. Instead,
some pixel columns are left out, making the drawn "line"
appear as a striped band (with variable stripe pattern). Is
this the case for other platforms as well?

I assume it's caused by some calculations w/round off error
to/from normalized coordinates or such.

It's quite weird, cause I get correct results for the
following loop:

for i=0.0,500,1.0000001 do plots,[i,i,i],[300,301,302],/device,psym=3

*and* for the following:

for i=0.0,500,.9999999 do plots,[i,i,i],[300,301,302],/device,psym=3

But not for this:

for i=0.0,500,1.0 do plots,[i,i,i],[300,301,302],/device,psym=3

(So it's not simply the *type* of the variable i that's causing this..)

Doesn't quite make sense, does it?

Regards,

Stein Vidar

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[Message index]

		Annoyances...how about this one? By: steinhh on Tue, 08 September 1998 00:00
		Re: Annoyances...how about this one? By: Imanol Echave on Mon, 14 September 1998 00:00

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