How to plot surf or imagesc for my data?

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Nisar Ahmed 2021-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/898017-how-to-plot-surf-or-imagesc-for-my-data

评论： Nisar Ahmed 2021-8-27

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Hi,

This is my figure code, it comprises on 38 VP vs TWT plots as:

h = plot(VP1,TWT1,VP2+500,TWT2,VP3+1000,TWT3,VP4+1500,TWT4,VP5+2000,TWT5,VP6+2500,TWT6,...
    VP7+3000,TWT7,VP8+3500,TWT8,VP9+4100,TWT9,VP10+4500,TWT10,VP11+5000,TWT11,VP12+5500,...
    TWT12,VP13+6000,TWT13,VP14+6500,TWT14,VP15+7000,TWT15,VP16+7500,TWT16,VP17+8000,TWT17,...
    VP18+8500,TWT18,VP19+9000,TWT19,VP20+9500,TWT20,VP21+10000,TWT21,VP22+10500,TWT22,...
    VP23+11000,TWT23,VP24+11500,TWT24,VP25+12500,TWT25,VP26+13000,TWT26,VP27+13500,TWT27...
    ,VP28+14000,TWT28,VP29+14500,TWT29,VP30+15000,TWT30,VP31+15500,TWT31,VP32+16000,TWT32,...
    VP33+16500,TWT33,VP34+17000,TWT34,VP34+17500,TWT34,VP35+18000,TWT35,VP36+18500,TWT36...
    ,VP37+19000,TWT37,VP38+19500,TWT38);

I want to to plot it as imagesc rather than vertical curves. How can I do it?

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Walter Roberson 2021-8-16

You have a number of X and Y values, but it is not clear to us what your Z values are. For example for X = 458158.62 Y = 6526223.5 then what color do you want associated ? What variable holds the information that can be used to compute the color?

Or is the color intended to be calculated by relative position, such as computing the total length of the line described by VP1, TWT1 and then coloring any given point proportional to the distance the point is along the line?

Or perhaps you want to set up a gradient with the minimum X over all the VP* variables should have a 0 red component, and the maximum X over all the VP* variables should have maximum red component, and every point should be assigned a proportionate red componet; and the same kind of thing with setting a green component according to the portion of Y value? So each point would have a computed red component and green component according to its position? So one corner would be black, one corner would be red, one corner would be green, one corner (opposite black) would be yellow (red+green) ?

Nisar Ahmed 2021-8-26

@Walter Roberson thank you,

I have Z as distance (d) and I am generating it know. So plot like imagesc, can I make a matrix like

vp = [VP1 VP2 VP3 VP4 VP5 VP6 VP7.....]

Nisar Ahmed 2021-8-27

Hi @Walter Roberson

Now I have z file as well. Please see the attached data:

I want to plot imagesc(d, TWTi, vp). I mean TWTi along y axis and is common for all vp curves. while d is the distance between each vp curve.

Can you please help me to produce a figure.

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回答（1 个）

Walter Roberson 2021-8-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/898017-how-to-plot-surf-or-imagesc-for-my-data#answer_766582

https://www.mathworks.com/help/vision/ref/insertshape.html

Use the Computer Vision insertShape() function to "draw" the lines into an array. Afterwards you can image() the resulting array.

imagesc() is not really suitable for this situation: you would be storing colored pixels into the array, not relative values.

Perhaps I am misunderstanding what kind of plot you were looking for ??

If your primary purpose is just display, then I would not recommend going through the trouble of doing the insertShape -- not unless you are building an image to display on a Raspberry Pi display or to store into a file.

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Nisar Ahmed 2021-8-16

Hi @Walter Roberson

When I tried to run your code, following error appears

Error using griddedInterpolant

The grid vectors must contain unique points.

Error in interp1 (line 151)

F = griddedInterpolant(X,V,method);

Error in Real_data_inversion>@(v,t)interp1(v,t,VP_lin)

Error in Real_data_inversion (line 211)

TWTs_interp = cellfun(@(v,t) interp1(v,t,VP_lin), VPs(:), TWTs(:), 'uniform', 0);

Walter Roberson 2021-8-16

At least one of your VP* variables contains duplicate points; perhaps the line doubles back on itself.

In that situation, I am having trouble imagining what result you are hoping for.

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