How to draw lines through elements with same value

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James Lorringer
James Lorringer 2015-9-9
评论： James Lorringer 2015-9-9
Hello! I have a small question here:
Suppose I have a matrix A, it looks like:
1 2 3 4 5 6 7
2 1 3 5 4 6 9
4 1 3 8 6 7 5
Now I want to plot the lines through points with value=1 and value=5 into a 2D plot, where x axis is created by for loop:
for i = 10:1:17;
end
and y axis is created by for loop:
for j = 2.5:0.1:2.7;
end
Can someone help me on this? It is possible to make the lines as smooth as possible?
Thanks a lot!

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Walter Roberson
Walter Roberson 2015-9-9
selected = (A==1) | (A==5);
image(selected, 'XData', [10 16], 'YData', [2.5 2.7]);
Possibly you would prefer
contour(10:16, 2.5:0.1:2.7, A, [1 5])
Note my correction of the 10:17 to 10:16 as you only have 7 elements rather than 8
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