[R] Implement a Fomula

PIKAL Petr
Wed, 15 Jan 2014 07:37:22 -0000

Hi

It seems to me that you would do yourself a favor if you go through R-Intro. See
in line.

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Norman McBride
> Sent: Tuesday, January 14, 2014 11:56 PM
> To: r-help at r-project.org
> Subject: [R] Implement a Fomula
>
> Now, if I were to move the data over from an excel doc would that
> change anything. I do understand that that I would have to change it to
> a csv document and create a variable for it. Just to give you a more

No. It is one of ways. Quite often it is possible directly copy data by

read.table("clipboard") command.

No. You does not need to create **variable**. read.* function directs its output
to console but you can redirect it to an **object** which is called data.frame.


> visual understanding of what I am doing I attached a picture of the
> head of the data.  So the formula would specifically be:  Battery Heat

No attachments allowed (with few exceptions). Use dput(head(yourdata)) and copy
the result directly to email.

> (Watts) / ( Surface Area (Square Meters) * ( Battery Temperature
> (Celsius) - Air Temperature (Celsius) ) and that would be the value put
> into the Cooling Coefficient Column currently set at one. One final
> note, when using
> function() should I input variable such as a,b, c and then change then
> change them when using the do.call function or should I just do it with
> the column names the first time? Thank you for the help I really
> appreciate it.

Why do.call? If variables in your data frame are named e.g. bh, sa, bt, at and
your data frame name is eg. cool you can just do

cool$cc <- with(cool, bh/(sa*bt-at))

to get new computed column.

Regards
Petr

>
>
>  -Peter

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