7 февр. 2022 г. · Try y==a+b/.{a->2d+e,b->f+g} and see if that is what you are looking for. That takes the expression y==a+b and does the list of substitutions to it.

11 февр. 2011 г. · I have the expression D[f[x, y], x] , and I want to substitute f[x,y] with x*y , I tried the following: D[f[x, y], x] /.

5 июн. 2019 г. · Begin by establishing the input: variables is just a list of the atomic variable names; terms is a list of the values to expand R , P , N1 , and ...

14 дек. 2010 г. · I'd like to find the Euler-Lagrange equations for a functional of the function phi[x,y] and then make a substitution for the function phi[x,y].

9 дек. 2011 г. · The expression has a couple of subexpressions that repeat throughout it. I want to be able to replace a/(b^2+c^2) with d and alpha+beta with gamma.

16 авг. 2011 г. · I would like to replace the values in column "Blah" given the value taken in column "COGCondition" such that:

4 окт. 2022 г. · How can I replace part of an equation in Wolframalpha with another variable? For instance if I have a matrix P = {{a+b+c+d+q/(p+a)-bc^2, a, ...

15 мар. 2021 г. · The goal is to solve for delta, beta and gamma. I want to substitute different values of nx,ny,nz,theta into these equations and get the solutions.

1 июн. 2023 г. · Create a sort of function that takes an item from your list of functions and replaces the n with an item from your apple list and then does that for every item ...

15 нояб. 2022 г. · I want to replace the element whose first part equals to 2 with more than one element. In this case it would be {2, 3/19, 3} , replaced by {2, 6/19, 3}, {1, 1/ ...