1
vote
1answer
93 views

Matrix substitution

I'm newbie in Mathematica and would like to ask one simple question. Let's say I have matrix with some elements == -1 ...
0
votes
2answers
76 views

Replace matrix with conditions

I want to replace the values of 1. in slot under the condition that the year and month in basevalue and ...
1
vote
3answers
111 views

Conditional Check on Matrix

Suppose I have the following matrix (i,j): ...
0
votes
0answers
64 views

Back Linear Substitution

I have an equation set Ax=b and A(n*m),n<m . To lower down the dimension, I express some vars by other vars, which gives ...
0
votes
1answer
175 views

Problem with determinant calculation [closed]

I have a 12x12 matrix (2D list), called M, which depends on some variables. Usually I set all of the expect of one (call it x). ...
2
votes
2answers
280 views

Mass Symbolic Manipulation with Subscripts? (from plaintext Input)

The simplest example of the change being sought is a greek letter, typed in as plaintext nu, and its may be replaced by the symbol, ν: expr = 3nu*kx*ky+ ...
7
votes
4answers
189 views

Generating all matrices with 1 (possibly) replaced by -1

I have a matrix $M$, whose dimension I am unsure of, which has only $\lbrace0,1\rbrace$ entries. I would like to generate all the possible matrices that result from changing (some subset) of the $1$'s ...