how to use hold on for two different imagesc plots

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Megha 2021-2-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/746552-how-to-use-hold-on-for-two-different-imagesc-plots

评论： Walter Roberson 2021-2-16

I have a matrix like below and want to find imagesc(); hold on; imagesc();

t1 = [1 2 3 6 7];
E1 = [-0.00660786358639598	0.0777130350470543	0.126017674803734	0.189686760306358	0.262237429618835]
fx1 = [5.6157475	5.5697780	5.5289726	5.4838061	5.4012895
    5.5453439	5.4993744	5.5572557	5.5120893	5.5418348
    5.6823254	5.6363554	5.5536976	5.5085306	5.4978499
    5.3619905	5.3160210	5.6277847	5.5826178	5.5214615
    5.5157361	5.4697666	5.4811044	5.4359379	5.4907508]
t2 = [4 5 8 9 10];
E2 = [1.39749240875244	1.44495928287506	1.49170267581940	1.53834557533264	1.58445668220520];
fx2 = [5.5889688	5.5429993	5.5185990	5.4734325	5.4242330
    5.4456487	5.3996792	5.7355318	5.6903653	5.4353333
    5.7974424	5.7514729	5.3296890	5.2845225	5.5169930
    5.6018438	5.5558739	5.2609043	5.2157373	5.5721898
    5.5223360	5.4763665	5.6631050	5.6179385	5.3880172]
        imagesc(E1,t1,fx1); % shading flat
        hold on;
        imagesc(E2,t2,fx2); % shading flat
        view([270 90]);

however, the o/p to this imagesc plot is very vague with misoverlaps.

Can anyone please help.

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Answer 1

Walter Roberson 2021-2-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/746552-how-to-use-hold-on-for-two-different-imagesc-plots#answer_624502

编辑：Walter Roberson 2021-2-16

在 MATLAB Online 中打开

t1 = [1 2 3 6 7];

E1 = [-0.00660786358639598 0.0777130350470543 0.126017674803734 0.189686760306358 0.262237429618835];

fx1 = [5.6157475 5.5697780 5.5289726 5.4838061 5.4012895

5.5453439 5.4993744 5.5572557 5.5120893 5.5418348

5.6823254 5.6363554 5.5536976 5.5085306 5.4978499

5.3619905 5.3160210 5.6277847 5.5826178 5.5214615

5.5157361 5.4697666 5.4811044 5.4359379 5.4907508];

t2 = [4 5 8 9 10];

E2 = [1.39749240875244 1.44495928287506 1.49170267581940 1.53834557533264 1.58445668220520];

fx2 = [5.5889688 5.5429993 5.5185990 5.4734325 5.4242330

5.4456487 5.3996792 5.7355318 5.6903653 5.4353333

5.7974424 5.7514729 5.3296890 5.2845225 5.5169930

5.6018438 5.5558739 5.2609043 5.2157373 5.5721898

5.5223360 5.4763665 5.6631050 5.6179385 5.3880172];

imagesc(E1,t1,fx1); % shading flat

hold on;

imagesc(E2,t2,fx2); % shading flat

xlim([-.1 1.7]); ylim([0 11])

view([270 90]);

Remember, when you use hold on, you "hold" the automatic determination of the axes limits according to the plotted data.

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Megha 2021-2-16

Walter Roberson Exactly, this is what i am getting, why the lower part do not show white space (gap) at x=4 and x=5 like how it does beyond x=7? Similarly why upper part do not show white space (gap) at x=6 and x=7??

Walter Roberson 2021-2-16

https://www.mathworks.com/help/matlab/ref/imagesc.html?searchHighlight=image%20xdata&s_tid=srchtitle#buxkjup-x

The current documentation for the x and y coordinates only defines passing a scalar or a two-element vector for position.

Historically there is documentation somewhere that if you pass in a vector of values with more than one element, then it uses the first and last elements of the vectors and ignores the rest.

You do not pass in coordinates for the center of each pixel, only information about the centers of the lower left and upper right corners. MATLAB has never permitted you to pass in a vector of values for the centers of each column individually.

What MATLAB does offer is pcolor(), which permits you to pass in positions about the vertices of each face of a surface, with the color of the face being taken by interpolation from the data associated with its four corners. pcolor() however does not put in gaps: it fills the color in for the entire face rectangular face.

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