How to convert the points with respect to co-ordinate system?
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Swapnil Rane
le 30 Mar 2018
Commenté : Walter Roberson
le 30 Mar 2018
I have huge three 90*85 matrices with x,y,z values calculated from the left upper corner of the matrix. I would like to change the points with respect to new coordinate system.
How can I convert the points? Do you need more explanation?
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Roger Stafford
le 30 Mar 2018
@Swapnil Rane: Yes, we do indeed need much more explanation. Aside from simply applying the conversion formulas from the current to the new coordinate systems for each triplet within the three respective matrices, what is it you are asking?
Also what is the significance of the phrase "calculated from the left upper corner"? What does it matter how these original values were calculated, with regard to the task of computing the necessary conversions?
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Walter Roberson
le 30 Mar 2018
Usually you would create a transformation matrix, either 3 x 3 or 4 x 4, and you would take the three matrices and reshape them and concatenate them to create columns of a vector, and then use matrix multiplication by the transformation matrix. Take the N x 3 or N x 4 matrix that results and reshape the columns back to the original size of your input matrices.
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Walter Roberson
le 30 Mar 2018
Just subtract off the location of the center from the coordinates.
x_center = mean(x(:));
y_center = mean(y(:));
z_center = mean(z(:));
newx = x - x_center;
newy = y - y_center;
newz = z - z_center;
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Abhishek Ballaney
le 30 Mar 2018
https://in.mathworks.com/help/matlab/cartesian-coordinate-system-conversion.html
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