Save values from an expression that is created from deriv command

Dear all,

I want to save a value from an expression that I created by using the deriv
function. So for example the output from an expression using the deriv
command is:

expression({
? ?.expr7 <- 4 * b.nox.2^2 - 12 * b.nox.3 * b.nox.1
? ?.expr9 <- -2 * b.nox.2 - sqrt(.expr7)
? ?.expr10 <- 6 * b.nox.3
? ?.value <- .expr9/.expr10
? ?.grad <- array(0, c(length(.value), 1L), list(NULL, c("b.nox.3")))
? ?.grad[, "b.nox.3"] <- 0.5 * (12 * b.nox.1 * .expr7^-0.5)/.expr10 -
? ? ? ?.expr9 * 6/.expr10^2
? ?attr(.value, "gradient") <- .grad
? ?.value
})

The problem is that I do not know how to store the:

.grad[, "b.nox.3"] <- 0.5 * (12 * b.nox.1 * .expr7^-0.5)/.expr10 -
? ? ? ?.expr9 * 6/.expr10^2

and then use its numerical value in my code.

How can I store the above value or any output from the expression from deriv
command so I can use it later in the code?

Any help would be highly appreciated

Thanks

Dimitris
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