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POIn R, can out of bounds indexing return NAs on matrices, like it does on vectors?
 

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  1. POIn R, can out of bounds indexing return NAs on matrices, like it does on vectors?
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    <p>I would like an out of bounds subscript on a matrix in R to return NAs instead of an error, like it does on vectors. </p> <pre><code>&gt; a &lt;- 1:3 &gt; a[1:4] [1] 1 2 3 NA &gt; b &lt;- matrix(1:9, 3, 3) &gt; b [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 &gt; b[1:4, 1] Error: subscript out of bounds &gt; </code></pre> <p>So I would have liked it to return:</p> <pre><code>[1] 1 2 3 NA </code></pre> <p>Right now I am doing this with ifelse tests to see if the index variables exist in the rownames but on large data structures this is taking quite a bit of time. here is an example:</p> <pre><code>s &lt;- split(factors, factors$date) # split so each date has its own list names &lt;- last(s)[[1]]$bond # names of bonds that we want cdmat &lt;- sapply(names, function(n) sapply(s, function(x) if(n %in% x$bond) x[x$bond == n, column] else NA)) </code></pre> <p>where factors is an xts with about 250 000 rows. So it's taking about 15 seconds and that's too long for my application. </p> <p>The reason this is important is that each list element I am applying this to has a different length, but I need to output a matrix with equal length columns as a result of the sapply. I don't want another list out with different length elements. </p>
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    1. USThomas Browne
    1. USThomas Browne
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      1. POIn R, can out of bounds indexing return NAs on matrices, like it does on vectors?
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      1. VTUpMod
    1. COI think you should explain what your *actual* problem is. From here, I seem to get the idea that you've a list output from `sapply` from which you want a matrix filling missing values with `NA`. If so, `rbind.fill` function from `plyr` package might just do the job for you.
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      1. POIn R, can out of bounds indexing return NAs on matrices, like it does on vectors?
      1. USArun
 

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