relabel x axis tick marks

2011 8 2
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Hi,
Sorry for what seems an easy question, but I have been searching and have not found the answer.
I want to relabel the data points on the x-axis. Currently the x-axis is axis([0.27 0.9 0 1]) and I want the values shown to range from 30 to 85 rather than 0.27 to 0.9. So where the graph currently had label 0.27 on the x axis, replace that with 30 and so on upto replacing 0.9 with 85.
axis([30 85 0 1]) obviously puts the axis out of range of the data. Hope that makes sense, thanks in advance,
Rhys

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Walter Roberson
Walter Roberson 2011-8-2

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set() the XTickLabel to whatever cell array of strings that you want.
It would be easier if there was a nice formula for determining the bounds. For example, .27 * (1000 / 9) gives 30, but .9 * (1000/9) gives 100 rather than the desired 85. There is a linear formula given those two bounds, but it is 87.3015873015873 * x + 6.42857142857143 which seems too ugly to be plausible.

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Walter Roberson
Walter Roberson 2011-8-2
You want a tick range of 55 (30 to 85) over an axis range of 0.63 . Are you sure these are the correspondences you want?
Rhys
Rhys 2011-8-2
Re: question about values, it may seem odd, it is a pc monitor luminance reading (in candelas - 30 to 85 candelas, given a display brightness value in the programme of between 0.326 and 0.9 as below). Ive fitted response values to different luminance values in the range 0.27 and 0.9 and am populating the x axis between these with candela's which is hopefully something more meaningful.

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Rhys
Rhys 2011-8-2

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Thanks Walter and Fangjun, used both in the end
plot(StimLevels, ProportionCorrectOnset, 'k.', 'markersize',30,'HandleVisibility','off');
axis([0.27 0.9 0 1]);
set(gca,'XTick', [0.326 0.379 0.431 0.483 0.535 0.587 0.639 0.691 0.743 0.796 0.848 0.9])
set(gca,'XTickLabel', [ 30 35 40 45 50 55 60 65 70 75 80 85])
set(gca,'fontsize',12);
Fangjun Jiang
Fangjun Jiang 2011-8-2

0 个投票

set the 'XTickLabel' property of the axes.
h=axes;
get(h,'XTickLabel') % shows 0 to 1
set(h,'XTickLabel',num2str((1:11)')) %shows 1 to 11

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Walter Roberson
Walter Roberson 2011-8-2
You indicate to set the XTick property but show setting the XTickLabel property.
Fangjun Jiang
Fangjun Jiang 2011-8-2
Thanks! Updated.

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