Problem using semilogx plot command

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HenryatNU
HenryatNU 2016-6-17
评论： dpb 2018-2-2
I have a script with several semilogx plots -on OSX10.11.5 with R2016a. They work fine except for the very last one. Instead of a log scale for the x-axis it produces a linear one. I can see no difference in it at all from the others. I copy below first one of the good ones then the bad one;
GOOD -log plot: semilogx(ipTotal,alt,'-k')
NotGOOD-gives linear x-axis: semilogx(e_total(20:61),alt(20:61),'-k')
I am baffled by this one. Could there be some hidden special character or something?
Any suggestions greatly appreciated...
SOLVED:
I just figured it out. I had put a "hold on" before the semilogx - my bad.
When I rearranged it everything worked fine. Clue came when I tried the same semilogx in the interactive terminal and got the semilog plot, so I knew it had to be something I had done in the script.
Thanks for the comments. They helped me take another good look at what I had done...
  2 个评论
Chad Greene
Chad Greene 2016-6-17
It might help if you can share enough code to replicate the problem.
dpb
dpb 2016-6-18
Mayhaps the data have negative values so couldn't do log? Don't have the new graphics engine here so not sure what it would do in such case...

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回答（1 个）

Dennis Dunn
Dennis Dunn 2018-2-2
I still have the same problem you did, except I called "hold on" before making individual semilogx calls. Each plot is together on the same graph, but the only way I can get the log scale to show up is to call:
set(gca, 'XScale', 'log');
  1 个评论
dpb
dpb 2018-2-2
Release/OS?
Can you post a runable example that duplicates the problem?

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