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Re: Divide By Zero error [message #27904 is a reply to message #27901]

Thu, 08 November 2001 21:24

Paul Manusiu
Messages: 8
Registered: October 2001

Junior Member

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What is the log of zero ??
Logan Lindquist wrote:
<blockquote TYPE=CITE><style></style>
I
got another one for all you math whiz's! Here
is the error*****IDL>
.STEP% Program caused arithmetic error: Floating divide
by 0% Program caused arithmetic error: Floating illegal
operand  Caused by second
statement [log]****f
= fft(tempfft, -1)power
= -alog10(double(f))  I
tried a bunch of different things trying to isolate the error and get it
to stop. That is why the code looks that way and not all nice and compact.
I don't understand exactly why it's givng me invalid numbers and so this
is why I shall include the output data: print,
f*****(
55.0313, 0.000000)( 0.378331, 1.10309)( -0.281250, 0.312500)( -0.284581,
0.134343)( -0.281250, 0.000000)( -0.284581, -0.134343)(
-0.281250, -0.312500)( 0.378331, -1.10309)( 0.467505,
0.265950)( 0.117743, -0.359700)( 0.0514515, -0.0800206)( 0.0514515, -0.0175206)(
0.0643956, -0.00457645)( 0.0735485, 0.00457646)( 0.0643956,
0.0396177)( 0.139840, 0.0266735)( -0.234375, 0.265625)(
0.0312500, -0.0845971)( -0.0156250, -0.0156250)( -0.0129442, -0.0533471)(
0.0156250, -0.0468750)( 0.0312500, -0.0404029)( -0.0156250,
-0.0156250)( 0.0754442, -0.00915291)( -0.217505, 0.109700)(
0.0735485, -0.0487706)( -0.00189563, 0.0708677)( 0.00725728, -0.0159502)(
-0.00189563, 0.0266735)( -0.0148398, -0.00457646)(
0.0735485, 0.0137294)( 0.0514515, -0.0266735)( -0.187500,
0.000000)( 0.0377221, -0.0156250)( 0.000000, 0.000000)( -0.00647209, 0.0156250)(
0.000000, 0.000000)( -0.00647209, -0.0156250)( 0.000000,
0.000000)( 0.0377221, 0.0156250)( -0.217505, -0.109700)(
0.0514515, 0.0266735)( 0.0735485, -0.0137294)( -0.0148398, 0.00457646)(
-0.00189563, -0.0266735)( 0.00725728, 0.0159502)(
-0.00189563, -0.0708677)( 0.0735485, 0.0487706)( -0.234375,
-0.265625)( 0.0754442, 0.00915291)( -0.0156250, 0.0156250)( 0.0312500,
0.0404029)( 0.0156250, 0.0468750)( -0.0129442, 0.0533471)(
-0.0156250, 0.0156250)( 0.0312500, 0.0845971)( 0.467505,
-0.265950)( 0.139840, -0.0266735)( 0.0643956, -0.0396177)( 0.0735485, -0.00457646)(
0.0643956, 0.00457645)( 0.0514515, 0.0175206)( 0.0514515,
0.0800206)( 0.117743, 0.359700) print,
power*****IDL>
print, power-1.7406094 0.42212772 NaN NaN NaN NaN
NaN 0.422127720.33021387 0.92906595 1.2886023 1.2886023
1.1911436 1.1334259 1.1911436 0.85436921NaN 1.5051500
NaN NaN 1.8061800 1.5051500 NaN 1.1223743NaN 1.1334259
NaN 2.1392261 NaN NaN 1.1334259 1.2886024NaN 1.4234043
Infinity NaN Infinity NaN Infinity 1.4234043NaN 1.2886024
1.1334259 NaN NaN 2.1392261 NaN 1.1334259NaN 1.1223743
NaN 1.5051500 1.8061800 NaN NaN 1.50515000.33021387
0.85436921 1.1911436 1.1334259 1.1911436 1.2886023 1.2886023 0.92906595  What
is this NaN business and why am I getting Infinity? Arg :) Thanks
to the math geeks,Logan</blockquote>

  
  
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[Message index]

		Re: Divide By Zero error By: Logan Lindquist on Sat, 10 November 2001 14:10
		Re: Divide By Zero error By: Logan Lindquist on Sat, 10 November 2001 14:06
		Re: Divide By Zero error By: Craig Markwardt on Fri, 09 November 2001 14:59
		Re: Divide By Zero error By: Logan Lindquist on Thu, 08 November 2001 07:37
		Re: Divide By Zero error By: Logan Lindquist on Wed, 07 November 2001 13:25
		Re: Divide By Zero error By: Nigel Wade on Fri, 09 November 2001 01:34
		Re: Divide By Zero error By: Stein Vidar Hagfors H[1] on Mon, 12 November 2001 08:52
		Re: Divide By Zero error By: Paul Manusiu on Thu, 08 November 2001 21:24
		Re: Divide By Zero error By: Paul Manusiu on Tue, 13 November 2001 17:57

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