Reorganizing a large matrix into 4 other matrixes

2 次查看（过去 30 天）
rwn
rwn 2020-4-21
评论： rwn 2020-4-21
I am trying to write a code that will produce a contour plot of many PIV Data points from DaVis .txt files.
The .txt file has 4 columns of data (X coordinates, Y coordinates, U velocity, V velocity). As of now I have the code reading this file with dlmread skipping the first row. I need the program to reorganize the X column into its own matrix of 173x124, and the other columns to do the same for their own matrixes of the same size. I have the X,Y,U,V matrixes set to empty matrixes that need to be filled.
type B00001.txt;
A=dlmread('B00001.txt', '',1,0);
X=zeros(173,124);
Y=zeros(173,124);
U=zeros(173,124);
V=zeros(173,124);
pcolor(X,Y,U);
hold on
shading interp
colormap(jet);
colorbar
  1 个评论
Sriram Tadavarty
Sriram Tadavarty 2020-4-21
编辑：Sriram Tadavarty 2020-4-21
Ryan, can you place the B00001.txt file with the paperclip icon here?
What is the dimension of X column? Is that of value exactly equal to 173 x 124.
If yes, you can use reshape function. Like,
X = reshape(data(:,1),173,124);
Y = reshape(data(:,2),173,124);
U = reshape(data(:,3),173,124);
V = reshape(data(:,4),173,124);
Hope this helps.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Sriram Tadavarty
Sriram Tadavarty 2020-4-21
Hi Ryan,
Thanks for attaching the code.
The data is present in a matrix form with four columns covering X, Y, U, and V. You can just use the code that is placed in the comments and it will work.
Placing here again:
type B00001.txt;
A=dlmread('B00001.txt', '',1,0);
X = reshape(A(:,1),173,124);
Y = reshape(A(:,2),173,124);
U = reshape(A(:,3),173,124);
V = reshape(A(:,4),173,124);
pcolor(X,Y,U);
hold on
shading interp
colormap(jet);
colorbar
Hope this helps.
Regards,
Sriram

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

产品


版本

R2018b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by