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Feb
23
comment Are proofs by contradiction really logical?
From all this I understand that the counter-examples only happen when you define the contradiction wrong. If you ask to withdraw 20 dollars, and the bank says they are not there, that does not mean you don't have 20 dollars. The statements "your account at this moment contains 20 dollars" and "your account at this moment does not contain 20 dollars" are contradictory - and only if "this moment" is exactly identical in both statements.
Nov
5
revised Find the position difference between two transformations of a line
added 434 characters in body
Nov
5
revised Find the position difference between two transformations of a line
added 21 characters in body
Nov
5
revised Find the position difference between two transformations of a line
added 21 characters in body
Nov
5
revised Find the position difference between two transformations of a line
posted solution... that's probably bad...
Nov
5
revised Find the position difference between two transformations of a line
showed the transformation matrix
Nov
5
comment Find the position difference between two transformations of a line
@AaronGolden I don't quite get what you are saying... This is what I understand: If I perform a single transformation (for example translate, rotate, translate back) the pos does not change but the resulting matrix will contain translating coefficients. It is what I use to apply transformations for all objects (with or without scaling). What I need: values to translate the pos so that replacing the old transform with a new transform will leave a point unchanged - a point that is not used as anchor in any of the transforms.
Nov
5
revised Find the position difference between two transformations of a line
added 252 characters in body
Nov
5
revised Find the position difference between two transformations of a line
added 348 characters in body
Nov
5
comment Find the position difference between two transformations of a line
@AaronGolden Interesting suggestion, I am trying to apply reverse transform (I updated my question) - but like with everything I have tried, all points seem to move... A possible cause: the transform I must apply to the object rotates around center, but if I apply transforms to keep P2 (or P1) constant, the shift will be wrong... I just can't find a way to mix them... This may just be one cause of the "wrongness". Also - not quite clear on your statement "scales and rotations fix the origin" - do you mean they can be applied on a different origin ?
Nov
5
revised Find the position difference between two transformations of a line
showed with some code trying to do what comment suggested
Nov
4
asked Find the position difference between two transformations of a line
Nov
4
accepted How can I determine the sides in a squished hexagon?
Oct
20
revised Finding segments in a pentagon, to determine a fit-to-shape shift
deleted 107 characters in body
Oct
20
revised Finding segments in a pentagon, to determine a fit-to-shape shift
formatting
Oct
20
asked Finding segments in a pentagon, to determine a fit-to-shape shift
Oct
16
revised How can I determine the sides in a squished hexagon?
added 56 characters in body
Oct
16
revised How can I determine the sides in a squished hexagon?
added 133 characters in body
Oct
15
answered How can I determine the sides in a squished hexagon?
Oct
15
revised How can I determine the sides in a squished hexagon?
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