bar3 Axis labels don't reflect real data

Question

Austin 2013-6-17

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/79300-bar3-axis-labels-don-t-reflect-real-data

评论： Eric T 2015-3-11

I'm trying to plot Z bars against X and Y with more than a few data points. I would like the x and y axis labels to be the real x and y data. Using the example code below, each x and y bar should correspond to its X and Y axis data - but they don't. Plus, the tables change as I re-size the chart. I'm sure I'm just missing something simple.

Here's what I'm trying to accomplish, as shown in Excel: http://mutant.dnsalias.com/ctrx.pdf

surf() plots the correct axis, but the data points are not really connected in real life, so that plot is not really appropriate.

Here's and example:

format shortg
xAxis = sort(10*rand(20,1));
sprintf('XMin: %5f xMax: %5f', [min(xAxis) max(xAxis)])
yAxis = sort(30*rand(30,1));
sprintf('yMin: %5f yMax: %5f', [min(yAxis) max(yAxis)])
bar3(rand(20,30));
set(gca,'XTickLabel',xAxis)
set(gca,'YTickLabel',yAxis)

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Answer 1

Tom 2013-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/79300-bar3-axis-labels-don-t-reflect-real-data#answer_89031

在 MATLAB Online 中打开

Try scaling the tick marks based on the limits you've defined:

format shortg
xAxis = sort(10*rand(20,1));
sprintf('XMin: %5f xMax: %5f', [min(xAxis) max(xAxis)])
yAxis = sort(30*rand(30,1));
sprintf('yMin: %5f yMax: %5f', [min(yAxis) max(yAxis)])
bar3(rand(20,30));
tick = get(gca,{'XTick','YTick'});
x = linspace(min(xAxis),max(xAxis),length(tick{1}));
y = linspace(min(yAxis),max(yAxis),length(tick{2}));
set(gca,'XTickLabel',x)
set(gca,'YTickLabel',y)

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Austin 2013-6-17

Works better - but is there a way to label with the "exact" values? Take a look at the linked excel chart. That is exactly what I'm trying to accomplish in Matlab.

Thx

Eric T 2015-3-11