auto format x axis

Question

Jason 2014-2-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116747-auto-format-x-axis

评论： Jason 2014-2-20

In an attempt to change the x-axis format on a histogram (placed on a Axes object) from engineering format to just a number I have read that this can be done by using the "XTick" property of the axes.

I have images that have a greyscale upto 20500 and when I let matlab automatically control these it reverts to engineering mode. I only need 5 ticks and so was wondering how to use the following to change the ticks. They are by default set at 0, 0.2,0.4,0.6,1

XTck=get(handles.axes6,'XTick')

What i need is a way to take the current max value (20500) in this case and then work out the nearest multiple of 5 (that is larger than this value), and then modify the ticks by this.

e.g. in the above, if I made the max value 25000, then each one of my ticks will be 5000, so I could presumably change my ticks now by:

set(handles.axes6,'XTick', XTck*500) ??

Thanks for any comments Jason

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Answer 1

Mischa Kim 2014-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/116747-auto-format-x-axis#answer_124888

编辑：Mischa Kim 2014-2-19

在 MATLAB Online 中打开

Jason, this should do:

t     = 0:4700;
y     = rand(1,length(t));          % your data
t_lim = 1e3*ceil(t(end)/1e3);       % get axis limit: 5000
t_ax  = 0:t_lim;
n_int = 8;                          % define # of intervals
t_int = t_lim/n_int;
tt    = t_ax(rem(t_ax,t_int)==0);   % find tick locations
ttlab = num2cell(tt);               % and generate tick labels
plot(t,y)
set(gca,'XTick', tt, 'XTickLabel', ttlab)

assuming that your axis limits are 1000s. If you don't even know the order of magnitude of data points a priori (e.g., there are only 5 data points) then you need some more logic (such as a log10() ) to get the scaling factor, which is currently set to 1e3=1000.