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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