Qualification > Math

MAth4 help

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zara:
plz help me in q7 part (c) oct/nov 2001 .....dunno hw to do it ???

sweetsh:
Another question, if they asked you to write the transformation matrix (- -
                                                                                       - -) what would you put it?

Ghost Of Highbury:
@zara...cud u plz upload the paper...

zara:
actually m hvin the hard copy n no soft copy....its nt der on FEP as well.. :-\
so ne1 hvin a soft copy plz plzzz upload it hea....

Ghost Of Highbury:
@sweetsh..
i guess u r talking abt the next question

okk...heres how u do it

let the transformation matrix (2by2) be (a  b)
                                                      (c  d)

take 2 sets of co-ordinates from the object and arrange it vertically to form a 2 by 2 matrix
multiply it with the transformation matrix (abcd) and equate it to the corresponding sets of co-ordinates in the image
(again arranged vertically to form a 2 by 2 matrix)

lets take the points A and B

point  A - (2,2) gets mapped to (3,2)
point B  - (5,2) gets mapped to (7.5,2)

heres the equation desribed above

(2  5)   *   (a  b)    =    (3  7.5)
(2  2)       (c  d)           (2    2)

find the values of a,b,c,d by multiplying (3  7.5)    with the inverse of (2  5)
                                                       (2    2)                              (2  2)

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