Re: [R] problem with simple if() statement

From: Philippe Grosjean <phgrosjean_at_sciviews.org>
Date: Mon 06 Feb 2006 - 21:22:06 EST

Norman Goodacre wrote:

> the following code apprantely, for some grand old reason, induces a syntax error:

>
> if (seq[i] = "A") m <- trans[1,]
>
> where seq is a vector and trans is a matrix. I cannot for the life of me see why this is wrong. Syntax error is:
>
> Error: syntax error in "if (seq[i] ="
>
> Sincerely,
>
> Norman Goodacre

Please, read "An Introduction to R" provided with any version of R. The correct syntax for an equality condition is "==", not "=", so:

 > if (seq[i] == "A") ....

Best,

Philippe Grosjean



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