changing ticks position on the graph

Question

Wade 2023-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/1936844-changing-ticks-position-on-the-graph

评论： Wade 2023-3-29

Hi,

I have a problem that seems to be easy. I have created a heat map in form of matrix but the scale I want to set from -400 to 400. I was able to change the axes numbers but the ticks are at the centre of each square instead to be in between them. How to do it?

Thank you,

Regards,

Matti

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DGM 2023-3-28

编辑：DGM 2023-3-28

If the SW element of the heatmap represents data at (-400, -400), then that's where they're supposed to be in order to communicate that relationship.

If that element represents data at (-440, -440), then you might want to fix your x,y data so that it actually corresponds.

Wade 2023-3-29

thank you for your advice!

BW,

Matti

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Answer 1

Bjorn Gustavsson 2023-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/1936844-changing-ticks-position-on-the-graph#answer_1203744

在 MATLAB Online 中打开

If you have coordinates for the edges of the cdata-elements then you can either adjust things manually to get what you want:

dx = 80;
dy = 80;
heatmap(x+dx/2,y+dy/2,cdata)
set(gca,'xtick',x,'ytick',y)

Or perhaps use pcolor instead of heatmap:

dx = 80;
dy = 80;
pcolor([x(:)',x(end)+dx],[y(:),y(end)+dy],cdata([1:end,end],[1:end,end])),shading flat

That should be rather close, I hope. This centre-of-pixel vs edge-of-pixel is a problem that will always persist and never have a solution that satisfies every user in all cases - we just have to learn to work around the given behaviours to get the output that corresponds to our use-cases.

HTH