How to zero the data points behind the line of figure?

Question

Smithy 2021-1-28

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/729098-how-to-zero-the-data-points-behind-the-line-of-figure

评论： KSSV 2021-1-28

采纳的回答： KSSV

I have a figure of plot3 and I would like to making the data contacting the blue line to zero.

How to zero the data points behind (contacting) the line..

clear all;clc;close all;

data = ones(100,200);

x = (0:1:size(data,2)-1)*0.1;

y =(0:1:size(data,1)-1)*0.1;

surf(x,y,data*100); hold on;

grid off;

colorbar;

view([0 90])

shading interp;

set(gca,'xlim',[min(x)-2 max(x)+2],'ylim',[min(y)-2 max(y)+2])

x = [2.4;13.9];

y = [-0.5;9.8];

plot3(x,y,1000*ones(length(x),length(y)),'b','LineWidth',10)

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Answer 1

KSSV 2021-1-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/729098-how-to-zero-the-data-points-behind-the-line-of-figure#answer_607998

编辑：KSSV 2021-1-28

在 MATLAB Online 中打开

data = ones(100,200);
x = (0:1:size(data,2)-1)*0.1;
y =(0:1:size(data,1)-1)*0.1;
x1 = [2.4;13.9];
y1 = [-0.5;9.8];
p = polyfit(x1,y1,1) ; 
x2 = x ;
y2 = polyval(p,x2) ; 
[X,Y] = meshgrid(x,y) ; 
idx = knnsearch([X(:) Y(:)],[x2' y2']) ; 
data(idx) = 0 ; 
surf(x,y,data*100); hold on;
grid off;
colorbar;
view([0 90])
shading interp;
set(gca,'xlim',[min(x)-2 max(x)+2],'ylim',[min(y)-2 max(y)+2])
% plot3(x1,y1,1000*ones(length(x1),length(y1)),'b','LineWidth',10)