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Maths help

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pedrojosetrujillo:
Does anyone knw what the rotation, relfection, shear and stretch matrices are?

hitham_1221:
EASY!!! wt exactly u want??? ;D
cuz for every1 it depends on the position and scale factor if any.

pedrojosetrujillo:
Im doing jun 05 paper 4 and it asks me to find the 2x2 matric which represents the transformation that maps x onto q. X onto q is a reflection on the y=-x axis. What would be the the 2x2 i would need? Like the general formula.

Q80BOY:

--- Quote from: pedrojosetrujillo on May 16, 2009, 01:01:25 pm ---Im doing jun 05 paper 4 and it asks me to find the 2x2 matric which represents the transformation that maps x onto q. X onto q is a reflection on the y=-x axis. What would be the the 2x2 i would need? Like the general formula.

--- End quote ---

the matrix for reflection in line y=x is 0 1
                                                  1 0

the matrix for refection in line y=-x is 0 -1
                                                  -1 0

the matrix for clockwise rotation of 90 degrees about the origin is 0 1
                                                                                       -1 0

the matrix for anticlockwise rotation of 90 degrees about the origin is 0 -1
                                                                                             1  0

pedrojosetrujillo:
Thanks man really aprrecitate it. My teacher couldnt tell me this stuff when i asked him. Anymore i would need to knw?

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