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POR error: Wrong length for a vector, should be 2
 

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  1. POR error: Wrong length for a vector, should be 2
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    <p>Here is a gist of what I want to do:</p> <p>I've got 2 data frames:<br> x (id is unique)</p> <pre><code>id timestamp 282462839 2012-12-05 10:55:00 282462992 2012-12-05 12:08:00 282462740 2012-12-05 12:13:00 282462999 2012-12-05 12:48:00 </code></pre> <p>y (id is not unique)</p> <pre><code>id value1 value2 282462839 300 100 282462839 300 200 282462839 400 300 282462999 500 400 282462999 300 150 </code></pre> <p>I also have a function myfunc(id,pvalue) that computes something and returns one of the value2 values depending on pvalue and other value1s (more complicated than just pvalue==value1)</p> <p>I want to create a 3rd column for x that contains the corresponding computed myfunc(id,pvalue), where pvalue is an integer that is constant(say 20). </p> <p>so in essence, I want to do this:</p> <pre><code>x$t20 &lt;- myfunc(x$id,20) </code></pre> <p>I tried using lappy and sapply this way:</p> <pre><code>x$t20 &lt;- sapply(as.vector(x$id),myfunc,pvalue=20) </code></pre> <p>I tried using lapply and without the as.vector as well, but I kept getting this error:</p> <pre><code>Error in .pointsToMatrix(p2) : Wrong length for a vector, should be 2 </code></pre> <p>It works when I just give mean where it just replicates $id in $t20.</p> <p>How do I do this?</p> <p>EDIT 1: Here's a skeleton of myfunc:</p> <pre><code>myfunc &lt;- function(xid,pvalue) { result &lt;- subset(y,id==xid) retVal &lt;- -1 if(nrow(result) &lt; 12){ return(NaN) } for(i in (1:nrow(result))){ #code to process result } return(retVal) } </code></pre>
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    1. This table or related slice is empty.
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    1. USorderof1
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COIf your function `myfunc` is vectorized `x$t20 <- myfunc(x$id, 20)` should return what you want.
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      1. POR error: Wrong length for a vector, should be 2
      1. USDrDom
    2. COIf I do that, it gives me an error: Error in .pointsToMatrix(p2) : Wrong length for a vector, should be 2 In addition: Warning message: In id == xid : longer object length is not a multiple of shorter object length. my actual definition is myfunc(xid,pvalue) There is a line where i do: result <- subset(y,id==xid) I tried changing it to xid[1] but that still gave the vector length should be 2 error
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      1. POR error: Wrong length for a vector, should be 2
      1. USorderof1
    3. COIt seems that the problem is in function, please edit your post and add the code of `myfunc`.
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      1. POR error: Wrong length for a vector, should be 2
      1. USDrDom
 

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