Contour is plotting my data in reflected order?
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I'm using flip to solve this but is this intentional?
2 个评论
KSSV
2021-6-17
It depends on your data.
Amanda Liu
2021-6-17
My data:
The temperature is higher at the bottom row in my data, so contour will automatically arrange the top to be higher temperature and reflect my data?
采纳的回答
From a quick test you might not be asigning the x and y values when performing your contour() function. by doing so matlab will automatically assign the row and column indexing to match the matrix. So in your example your max data is at the bottom row which is technically the higher value in cartesian coordinates of row 10 (ie y axis 10). you can get around this by defining your x and y values to plot against.
so matrix position (1,1) (row 1, column 1) is top left, but when displayed it'll be bottom left.
%dummy data
[x y]=meshgrid(-5:1:5,-5:1:5);
z = x+(2*y+4).^2;
% plot with just z and then specifying the rows and columns of the matrix z
figure(1),subplot(211),contour(z),colorbar
title('original contour')
subplot(212),contour(-5:1:5,5:-1:-5,z),colorbar
5 个评论
Amanda Liu
2021-6-17
Joseph Cheng
2021-6-17
oh yes but what is x and y? does it follow what i'm discussing here where the first y value y(1) is your most negative or most positive value of y.
Amanda Liu
2021-6-17
编辑：Amanda Liu
2021-6-17
Joseph Cheng
2021-6-17
so then it would mean that the first row would be denoted at y values of 0 and the last row would be H which i'm assuming here is a positive value. which is why it plots flipped.
Amanda Liu
2021-6-17
更多回答（1 个）
Steven Lord
2021-6-17
0 个投票
Are you trying perhaps to put the contour plot on top of another graphics object, an image perhaps or maybe a pcolor? If so, see the "Change Direction of Coordinate System" example on the documentation page for the axis function.
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