/// <summary>Subtracts a matrix from this matrix and returns the results</summary>
/// <param name="arg">the matrix to subtract from this matrix</param>
/// <returns>a Matrix object</returns>
public virtual iText.Kernel.Geom.Matrix Subtract(iText.Kernel.Geom.Matrix arg)
{
iText.Kernel.Geom.Matrix rslt = new iText.Kernel.Geom.Matrix();
float[] a = vals;
float[] b = arg.vals;
float[] c = rslt.vals;
c[I11] = a[I11] - b[I11];
c[I12] = a[I12] - b[I12];
c[I13] = a[I13] - b[I13];
c[I21] = a[I21] - b[I21];
c[I22] = a[I22] - b[I22];
c[I23] = a[I23] - b[I23];
c[I31] = a[I31] - b[I31];
c[I32] = a[I32] - b[I32];
c[I33] = a[I33] - b[I33];
return(rslt);
}
/// <summary>
/// multiplies this matrix by 'b' and returns the result
/// See http://en.wikipedia.org/wiki/Matrix_multiplication
/// </summary>
/// <param name="by">The matrix to multiply by</param>
/// <returns>the resulting matrix</returns>
public virtual iText.Kernel.Geom.Matrix Multiply(iText.Kernel.Geom.Matrix by)
{
iText.Kernel.Geom.Matrix rslt = new iText.Kernel.Geom.Matrix();
float[] a = vals;
float[] b = by.vals;
float[] c = rslt.vals;
c[I11] = a[I11] * b[I11] + a[I12] * b[I21] + a[I13] * b[I31];
c[I12] = a[I11] * b[I12] + a[I12] * b[I22] + a[I13] * b[I32];
c[I13] = a[I11] * b[I13] + a[I12] * b[I23] + a[I13] * b[I33];
c[I21] = a[I21] * b[I11] + a[I22] * b[I21] + a[I23] * b[I31];
c[I22] = a[I21] * b[I12] + a[I22] * b[I22] + a[I23] * b[I32];
c[I23] = a[I21] * b[I13] + a[I22] * b[I23] + a[I23] * b[I33];
c[I31] = a[I31] * b[I11] + a[I32] * b[I21] + a[I33] * b[I31];
c[I32] = a[I31] * b[I12] + a[I32] * b[I22] + a[I33] * b[I32];
c[I33] = a[I31] * b[I13] + a[I32] * b[I23] + a[I33] * b[I33];
return(rslt);
}