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comment Is there a way to solve the linear equation, Ax=b, in which A is a “non-constant” sparse matrix that depends on x?
Could you post more of your MATLAB code? This could help us to find a solution for this problem with Mathematica.
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comment Finding all possible solutions to a math mind game
Thanks a lot for this great update! This is really a very nice solution too!!
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awarded  Nice Question
Feb
8
comment Finding all possible solutions to a math mind game
Thank you for this useful post! I like it much that I can define with your solution my terms etc. generally.
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awarded  Yearling
Jan
21
accepted Finding all possible solutions to a math mind game
Jan
21
comment Finding all possible solutions to a math mind game
@Artes, Thanks for this fantastic answer and for editing my question! Now I understand the code very well! Sorry for not mentioning from beginning on that e.g. e=w is not allowed, I thought this is obvious. To the 1 to 9 or 0 to 9 problem: I am not unsure about this ;-) The book from where I have this mind game uses 1 to 9. I guess, it does this because it is then a bit more difficult to find a solution by mind (only 6 possibilities instead of 14 or 46). Anyway, thanks again for your help! I learned much about writing nice code and I hope you and others had fun with this game;-)
Jan
21
comment Finding all possible solutions to a math mind game
@Rojo! Your add is easy to understand! Thanks a lot, that is really a nice idea! I am very happy about yours, Öskås and Artes help! If I find time, I will join the chat to ask questions about the code. Thanks for the invitation and thanks again for the help!
Jan
21
comment Finding all possible solutions to a math mind game
Thanks @Öskå for this fantastic add! Unfortunately your code is above my programming knowledge. If you find time, could you please describe shortly how it works? Perhaps you post also a complete new answer, then I would love to accept yours! Anyway, Thanks a lot!!
Jan
21
revised Finding all possible solutions to a math mind game
added 146 characters in body
Jan
21
comment Finding all possible solutions to a math mind game
Thank you for the quick reply and nice approach! But in your case (e.g. sol[[301]]) it would be: e = i = 5. But this is not allowed too (I will make this more clear in my question). How can I get rid of these wrong solutions?
Jan
21
asked Finding all possible solutions to a math mind game
Dec
5
comment Using FindFit for step functions
If you need step functions for your data sets, why don’t you work with Piecewise (see manual)?
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