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Options for log10 axes

   

1.
tick must be 1, 2, or 3. Annotations/ticks will then occur at 1, 1-–2–-5, or 1,–2,–3,–4–,...–,9, respectively.

2.
Append l to tick. Then, log10 of the annotation is plotted at every integer log10 value.

3.
Append p to tick. Then, annotations appear as 10 raised to log10 of the value (e.g., 10-5).


 
Figure 1.7: Logarithmic projection axis using separate values for anotation, frame, and grid intervals. (top) Here, we have chosen to anotate the actual values. Interval = 1 means every whole power of 10, 2 means 1, 2, 5 times powers of 10, and 3 means every 0.1 times powers of 10. We used -R1/1000/0/1 -JX3l/0.4 -Ba1 f2 g3. (middle) Here, we have chosen to anotate log10 of the actual values, with -Ba1 f2 g3 l. (bottom) We anotate every power of 10 using log10 of the actual values as exponents, with -Ba1 f2 g3 p.
\begin{figure}
\centering
\epsfig{figure=eps/GMT_-B_log.eps}
\end{figure}

 


next up previous contents index
Next: Options for exponential axes Up: The -B option Previous: The -B option
Paul Wessel
1999-12-03