glebedev's picture

Matrix3d / Subtract method adds

Project:The Open Toolkit library
Category:feature request

This is not subtraction:

/// Subtract left matrix from this matrix.
/// The matrix to subtract.
public void Subtract(ref Matrix3d matrix)
R0C0 = R0C0 + matrix.R0C0;
R0C1 = R0C1 + matrix.R0C1;
R0C2 = R0C2 + matrix.R0C2;
R1C0 = R1C0 + matrix.R1C0;
R1C1 = R1C1 + matrix.R1C1;
R1C2 = R1C2 + matrix.R1C2;
R2C0 = R2C0 + matrix.R2C0;
R2C1 = R2C1 + matrix.R2C1;
R2C2 = R2C2 + matrix.R2C2;

/// Subtract left matrix from this matrix.
/// The matrix to subtract.
/// The resulting matrix of the subtraction.
public void Subtract(ref Matrix3d matrix, out Matrix3d result)
result.R0C0 = R0C0 + matrix.R0C0;
result.R0C1 = R0C1 + matrix.R0C1;
result.R0C2 = R0C2 + matrix.R0C2;
result.R1C0 = R1C0 + matrix.R1C0;
result.R1C1 = R1C1 + matrix.R1C1;
result.R1C2 = R1C2 + matrix.R1C2;
result.R2C0 = R2C0 + matrix.R2C0;
result.R2C1 = R2C1 + matrix.R2C1;
result.R2C2 = R2C2 + matrix.R2C2;

/// Subtract left matrix from left matrix.
/// The matrix on the matrix side of the equation.
/// The matrix on the right side of the equation
/// The resulting matrix of the subtraction.
public static void Subtract(ref Matrix3d left, ref Matrix3d right, out Matrix3d result)
result.R0C0 = left.R0C0 + right.R0C0;
result.R0C1 = left.R0C1 + right.R0C1;
result.R0C2 = left.R0C2 + right.R0C2;
result.R1C0 = left.R1C0 + right.R1C0;
result.R1C1 = left.R1C1 + right.R1C1;
result.R1C2 = left.R1C2 + right.R1C2;
result.R2C0 = left.R2C0 + right.R2C0;
result.R2C1 = left.R2C1 + right.R2C1;
result.R2C2 = left.R2C2 + right.R2C2;


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AndyKorth's picture


I agree that the index operator would be great. And simply using the ListSeparator should be no problem. Will look at this later for my repo. I also considered a little more string formatting when displaying Vectors (which would also apply to matrices as well). Any thoughts on other format strings that would be helpful? Lining up each component? etc?

anathema's picture


The ability to specify the number of decimal-places to be output by ToString() is useful, although I'm not sure it necessarily belongs in the core Math classes. I've written extension-methods for my own use which do this.

My gut feeling is that ToString() with no parameters should output the values in as simple a format as possible - the UNIX principle that the output of one command may become the input of another seems a sane model here. Overloads of ToString() which take format-control parameters could be provided, but I'm not convinced: there's obviously no way you could cater to every possible requirement of an application, so it may be better to leave it alone completely :-)

The other method I added was a new constructor which takes a string (in the same format as output by ToString) and constructs a new Vector3d/Matrix4d/whatever from it.

AndyKorth's picture


Addressed these issues here:

* Issue 1880, Fix non-locale Vector ToString method
* Add create from quaternion method to Matrix4
* Added index getters and setters to all vector and matrix classes
* added Robmaister's Matrix3 implementations