Why is auto-scaling not following data on contour-plot?

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Steeven 2018-4-5

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https://ww2.mathworks.cn/matlabcentral/answers/392800-why-is-auto-scaling-not-following-data-on-contour-plot

评论： Adam 2018-4-5

I am creating two colour plots from matrix values, one with the heatmap(...) function and one with the contourf(...) function. The results are these:

And the code used to generate them is this:

xvalues = {'20 C','30 C','40 C','50 C','60 C','70 C','80 C','90 C'};
yvalues = {'80 %','60 %','40 %'};
figure(1)
c=heatmap(xvalues,yvalues,heat)
c.Colormap=parula;
figure(2)
contourf(heat)
set(gca, 'YDir', 'reverse')
set(gca,'xticklabel',xvalues)
set(gca,'yticklabel',yvalues)
colorbar

The matrix heat consists of 3 rows and 8 columns:

No tick-placing is done in the code. Only tick-labelling (and the issue happens with and without the labelling).

As you can see on the plots, the heatmap correctly auto-generates 8 ticks on the x-axis (due to the 8 columns) and 3 ticks on the y-axis (due to the three rows).

But not on the contour plot - there only the x-axis is correctly ticked with 8 ticks. And therefore my labelling fits the tick number. On the y-axis many ticks are auto-generated so my three labels are simply duplicated.

Why does the auto-generation of y-ticks not fit the 3 rows?