Frequency axis - Minor ticks

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sbonnefo
Posts: 34
Joined: Tue Aug 14, 2007 7:43 am

Frequency axis - Minor ticks

Postby sbonnefo » Thu Nov 29, 2007 2:22 pm

I have noticed several time that the location of minor ticks in logarithm scale is not well define. See for instance the enclosed file HV_MinorTick_log.jpg

Here the x axis (frequency) is displayed in logarithm. I manually change both major and minor ticks. It seems that only major ticks are logarithm scale.

Have you already noticed this bug?
Attachments
HV_MinorTicks_log.jpg
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Postby admin » Wed Dec 05, 2007 1:54 pm

I've just checked the position of minor ticks. They are correctly placed.

The interval between minor ticks is not constant. For .jpg image, from 1 to 2 the intervals in pixels are:

(1.0) 0, 23, 45, 65, 83, 100, 116, 131, 145, 158, 171 (2.0)
(1.0) 22, 20, 18, 17, 16, 15, 14, 13, 13 (2.0)

x 1.0, 1.1, 1.2, ... 1.9, 2.0
Log 0, 0.0414, 0.0792, ..., 0.279, 0.301

Ratio log/pixel 0.0018, 0.00176, ..., 0.00177, 0.00176

Hence the X scale of your graph is a correct log scale even for minor ticks. If the step between 1 and 1.1 is close to the one from 1.9 to 2, this is normal, this is log scale. The step difference is certainly less than between 1 and 10.


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