[R] How to pass a variable to a function which use variable name as a parameter
john.archie.mckown at gmail.com
Tue May 26 14:25:24 CEST 2015
On Tue, May 26, 2015 at 5:14 AM, wong jane <jane.wong083 at gmail.com> wrote:
> There are functions which use variable names as parameters in some R
> packages. However, if the variable name is stored in another variable, how
> can I pass this variable to the function. Taking the "rms" package as an
> n <- 1000
> age <- rnorm(n, 50, 10)
> sex <- factor(sample(c('female','male'), n,TRUE))
> y <- rnorm(n, 200, 25)
> ddist <- datadist(age, sex)
> fit <- lrm(y ~ age)
> Predict(fit, age, np=4)
> Here "age" was a variable name passed to Predict() function, but if "age"
> was stored in variable "var", that is, var <- "age", how can I pass "var"
> to Predict() function? The purpose is that I want to change the parameter
> of Predict() in a loop.
Please turn off HMTL email. The forum software doesn't really like it.
What you want is the "get()" function.
n <- 1000
age <- rnorm(n, 50, 10)
sex <- factor(sample(c('female','male'), n,TRUE))
y <- rnorm(n, 200, 25)
ddist <- datadist(age, sex)
ddist <- datadist(get(var),sex)
fit <- lrm(y ~ age)
Predict(fit, age, np=4)
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