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POR: NAs introduced by coercion in data frame
 

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  1. POR: NAs introduced by coercion in data frame
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    <p>I have a data frame that I build with data from an sql db. First column contains date, the other contain double or string which should be double.</p> <p>I need to convert the string to real double.</p> <p>I have tried to extract the data with "numbers" in another data frame and then: as.numeric or class = numeric.</p> <p>Both those options return error.</p> <p>Any idea?</p> <p>Many thanks, Vincent</p> <p>edit: here is the function where I got my issue/</p> <pre><code> function(Best,Worst,PriceTable){ PnL=data.frame() #PnL long for(i in 1:(nrow(Best)-1)){PnL[i,1]=Best[i+1,1];pnl=0;divide=0;for (j in 1:ncol(Best)){if((!is.null(PriceTable[i+1,as.character(Best[i,j])])) &amp;&amp; (!is.na(as.numeric(PriceTable[i+1,as.character(Best[i,j])])))){pnl=pnl+as.numeric(PriceTable[i+1,as.character(Best[i,j])]);divide=divide+1}};PnL[i,2]=pnl/divide;PnL[i,3]=0;PnL[i,4]=divide} #PnL short for(i in 1:(nrow(Worst)-1)){pnl=0;divide=0;for (j in 1:ncol(Worst)){if((!is.null(PriceTable[i+1,as.character(Worst[i,j])])) &amp;&amp; (!is.na(as.numeric(PriceTable[i+1,as.character(Worst[i,j])])))){pnl=pnl+as.numeric(PriceTable[i+1,as.character(Worst[i,j])]);divide=divide+1}};PnL[i,3]=-pnl/divide;PnL[i,5]=divide} colnames(PnL)[1]='Date' colnames(PnL)[2]='PnL Long' colnames(PnL)[3]='PnL Short' colnames(PnL)[4]='N trade long' colnames(PnL)[5]='N trade short' #overall PnL for (i in 1:nrow(PnL)){PnL[i,6]=PnL[i,3]+PnL[i,2]} colnames(PnL)[6]='PnL' return(PnL) </code></pre> <p>}</p> <p>My TablePrice look (in bigger) like:</p> <pre><code>row.names Date 25179M103 371532102 186905105 382388106 16 2011-01-25 0.08094573 0.001366867 -0.08003574 0.02431649 21 2011-02-01 0.10623324 0.033948941 0.02128497 0.02949376 40 2011-03-01 0.02046414 -0.028119508 -0.16465137 -0.09292013 63 2011-04-01 0.04486064 0.034553366 0.01336088 0.02603872 83 2011-05-02 -0.02220955 -0.016687422 -0.07369759 0.03656137 </code></pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USVincentH
    1. USVincentH
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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.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COThe column might not contain only numbers. But you did not even give us the error message ... Also, how exactly did you "build" the data.frame?
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      1. POR: NAs introduced by coercion in data frame
      1. USRoland
    2. COthe error message must be something like NAs introduced while automatic conversion (my R is not in English...). As for the construction of the data frame: I imported that to a first data frame with an sql query Then I reorganised my data frame with cast/reshape
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      1. POR: NAs introduced by coercion in data frame
      1. USVincentH
    3. COI can also have (on subset of the data frame) object list cannot be converted to type 'double'
      singulars
      1. POR: NAs introduced by coercion in data frame
      1. USVincentH
 

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