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Creating Semi-Log Graph

 
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Tezak
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PostPosted: Fri Oct 27, 2006 6:19 pm    Post subject: Creating Semi-Log Graph Reply with quote

I need to create a semi-log line graph, i've seen people mention a logarithmic option on here, but I can't find it anywhere, or any help topic about it. Any help would be appreciated.
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David
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PostPosted: Fri Oct 27, 2006 6:28 pm    Post subject: Re: Creating Semi-Log Graph Reply with quote

Use Graphmatica. You'll find a copy in the math archives:

http://archives.math.utk.edu

David.
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jrkrideau
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PostPosted: Sat Oct 28, 2006 8:57 am    Post subject: Re: Creating Semi-Log Graph Reply with quote

Tezak wrote:
I need to create a semi-log line graph, i've seen people mention a logarithmic option on here, but I can't find it anywhere, or any help topic about it. Any help would be appreciated.


I agree with David. I don't think there is any way to get Calc to do this. The only logarithmic function in graphing that I can see is the option to fit a logarithmic regression line to a set of data. You need a more sophisticated graphing package.
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jrkrideau
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RickRandom
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PostPosted: Sat Oct 28, 2006 11:26 am    Post subject: Reply with quote

I don't know if this is what you want, but you can set either axis (or both axes) to be a logarithmic. Thus you can have log-log, log-linear, or linear-log.

Click on the chart to select it.

Double-click to edit it, or right-click, Edit.

Select the axis, and double-click to edit the axis.

Select the Scale tab.

Select Logarithmic scale.
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Tezak
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PostPosted: Sat Oct 28, 2006 1:12 pm    Post subject: Reply with quote

Hmm, I guess i should be more specific, I need to plot several points on a semi-log chart (log scale on the y axis, normal scale on the x), and fit a line of best fit on this chart. After quick scan of graphmatica it looks like you need a line equation (which I don't have), but I could be wrong. RickRandom, I can't even see the options you described, although i was only trying a test chart with 3 points.
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RickRandom
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PostPosted: Sat Oct 28, 2006 1:35 pm    Post subject: Reply with quote

Make sure you have an X-Y chart, not a Line chart.
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David
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PostPosted: Sat Oct 28, 2006 2:02 pm    Post subject: Reply with quote

Tezak wrote:
I need to plot several points on a semi-log chart (log scale on the y axis, normal scale on the x), and fit a line of best fit on this chart. After quick scan of graphmatica it looks like you need a line equation (which I don't have), but I could be wrong.


You are. It does both equations andpoints and best fit.

Gotta go, but you an also check out http://www.padowan.dk

David.
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jrkrideau
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PostPosted: Sun Oct 29, 2006 8:00 am    Post subject: Reply with quote

RickRandom wrote:
I don't know if this is what you want, but you can set either axis (or both axes) to be a logarithmic. Thus you can have log-log, log-linear, or linear-log.

Click on the chart to select it.

Double-click to edit it, or right-click, Edit.

Select the axis, and double-click to edit the axis.

Select the Scale tab.

Select Logarithmic scale.


So it does. I never even noticed. Thanks.
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jrkrideau
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