Substitution of variables on the matrices and vectors (50g)

Hello

With the | (where) the im function capable of quickly replacing the variables in an equation with the numerical values.

for example (x - 2) ^ 4 + (x - 2y) ^ 2, {x 0 y 0}, | (Shift to the right, tool) gives 16

Suppose I have generated the Hessian matrix and the gradient of this feature and would have the same substitution to get (50-4, 8 - 4) and (0-32).

What is the fastest way to substitute these variables (| doesn't seem to work with this object)?

Concerning

Hi Teleboy,

You can try:

"{X 0 Y 0} |

MAP

or

"{X 0 Y 0} | SIMPLIFY. "
MAP

or, for easy use write a small program to assign to a user key (for example the key tool;) (D)

"1-> LIST {|}". + -> Map of PRG"--> corresponds to the arrow on the right. 256 library must be attached...
can do

{X 0 Y 0}    Your_Program (or user key)

CARD apply a program to each element of a list, vector or matrix. For example:

'(x-2) ^ 4 + (x-2 * y) ^ 2'
[« x » « y »]
HESS
DROP 2-> LIST
{x 0 y 0}
then user_key will do the job for each item in the list

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