plot 2D matrix data

Question

Sam Hurrell 2021-8-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/890832-plot-2d-matrix-data

回答： Star Strider 2021-8-4

data.mat

I have a numeric matrix array, with column 1 containing the x coordinate, column 2 containing the y coordinate, and column 3 containing the value at that xy position. How can I create a reliable 2d pcolor plot from this matrix?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2021-8-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/890832-plot-2d-matrix-data#answer_760732

在 MATLAB Online 中打开

The pcolor function requires a matrix argument, and the data provided here are a (5000 x 3) matrix with ‘X’, ‘Y’ and ‘Z’ columns. Creating a matrix from this is necessary if you want to use image, pcolor, or other such functions.

I would skip that and just use scatter3 and then rotate it using the view function:

LD = load('data.mat');
data25um = LD.data25um;
figure
scatter3(data25um(:,1), data25um(:,2), data25um(:,3), [], data25um(:,3), 's', 'filled')
grid on
xlabel('X')
ylabel('Y')
view(0,90)
axis('tight')

producing:

.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

darova 2021-8-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/890832-plot-2d-matrix-data#answer_759152

Use griddata to create matrices

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Sam Hurrell 2021-8-4

How can I use griddata for the data in its current form? The examples I've looked at seem to give values based on defined calculations rather from a data array?

请先登录，再进行评论。