In Matlab: How to create a 2d map from a 3 columns file

Question

Tony 2020-7-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/564512-in-matlab-how-to-create-a-2d-map-from-a-3-columns-file

编辑： KSSV 2020-7-15

Relatively new to Matlab, I've been tryin to create a 2d map from a 3 columns file (x coord, y coord, value of cell (x,y)) but not sure how to proceed.

For example:

1901 0 1

1901 -10 2

1901 -20 3

1902 0 -1

1902 -10 3.5

1902 -20 1.5

1903 0 5

1903 -10 -3

1903 -20 0

Thanks in advance for any help!

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Answer 1

KSSV 2020-7-14

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/564512-in-matlab-how-to-create-a-2d-map-from-a-3-columns-file#answer_465416

在 MATLAB Online 中打开

data = [1901 0 1
1901 -10 2
1901 -20 3
1902 0 -1
1902 -10 3.5
1902 -20 1.5
1903 0 5
1903 -10 -3
1903 -20 0 ] ;
x = data(:,1) ; y = data(:,2) ; z = data(:,3) ; 
nx = length(unique(x)) ; 
ny = length(unique(y)) ; 
X = reshape(x,[ny,nx]) ; 
Y = reshape(y,[ny,nx]) ; 
Z = reshape(z,[ny,nx]) ; 
pcolor(X,Y,Z) 
shading interp 
colorbar