adding only to the y value in matrix
显示 更早的评论
I need to add a constant only to the y value of all inputs in a matrix.
The task is to make it look like its lifted upwards on a graph.
3 个评论
Geoff Hayes
2021-2-11
Paul - which row or column of the matrix corresponds to the y value? Whichever that might be, just add the constant to it.
constantValue = 42;
matrix = randi(255,10,2);
matrix(:,2) = matrix(:,2) + constantValue; % add the constant value to the second column
Paul Jackson
2021-2-11
Geoff Hayes
2021-2-11
Or just add a constant to the column (or row) of the matrix that has the y data. You may need to show us what your current matrix looks like (how is it constructed, where are the x and y values), etc.
采纳的回答
The answer depends on how you're storing your coordinate data. Is it stored as two columns, the first x and the second y?
v = (1:10).';
xy = [v, v.^2];
plot(xy(:, 1), xy(:, 2))
If so just add your constant to the second column of xy.
Is your data stored as arrays of points each containing x, y, and z data?
[x, y, z] = peaks;
surf(x, y, z)
If so add your constant to the y array.
Is your data stored as an image?
im = imread('ngc6543a.jpg');
imshow(im)
In this case you'll probably want to add the 'XData' and 'YData' options to your imshow call.
Or is it stored in some other way? If so please describe how you're storing your data.
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