I use 'alias' to define variable dependencies.
But when I want to use the result of my calculation as an expression, I bite the dust; I cannot get rid of the dependencies.
Can anyone help me here?
In the simplified example below, I use the independent variables z and z to define z(z,z) and z(z,z).
I then introduce a function f(z,z) and its derivatives df_dz.
I introduce the names dz/dz=Dp[1,3], dz/dz=Dp[1,4] etc...
When I have calculated df_dz, however, I cannot insert values of z without affecting Dp[2,3].
Actually, now I have finished my calculation and want df_dz[2,3] to be a regular expression, so that I can insert values of
z without affecting the Dp:s.
How can I convert df_dz to a regular expression?
for j from 3 to 4 do