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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>R: Test if a value is missing, empty, or contains only NA or NULL values</title>
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<table width="100%" summary="page for invalid {gtools}"><tr><td>invalid {gtools}</td><td align="right">R Documentation</td></tr></table>
<h2>Test if a value is missing, empty, or contains only NA or NULL values</h2>
<h3>Description</h3>
<p>
Test if a value is missing, empty, or contains only NA or NULL values.
</p>
<h3>Usage</h3>
<pre>
invalid(x)
</pre>
<h3>Arguments</h3>
<table summary="R argblock">
<tr valign="top"><td><code>x</code></td>
<td>
value to be tested</td></tr>
</table>
<h3>Value</h3>
<p>
Logical value.</p>
<h3>Author(s)</h3>
<p>
Gregory R. Warnes <a href="mailto:warnes@bst.rochester.edu">warnes@bst.rochester.edu</a>
</p>
<h3>See Also</h3>
<p>
<code><a href="../../base/html/missing.html">missing</a></code>, <code><a href="../../base/html/is.na.html">is.na</a></code>,
<code><a href="../../base/html/is.null.html">is.null</a></code>
</p>
<h3>Examples</h3>
<pre>
invalid(NA)
invalid()
invalid(c(NA,NA,NULL,NA))
invalid(list(a=1,b=NULL))
# example use in a function
myplot <- function(x,y) {
if(invalid(y)) {
y <- x
x <- 1:length(y)
}
plot(x,y)
}
myplot(1:10)
myplot(1:10,NA)
</pre>
<hr><div align="center">[Package <em>gtools</em> version 2.4.0 <a href="00Index.html">Index]</a></div>
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