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POFor loop ignore my first item
 

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  1. POFor loop ignore my first item
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    <p>I would be appreciative if you can help me with the following two issues:</p> <ol> <li>The 'for' loop below ignores my first looping item. The code below is a small part of my program. Here, I am iterating the object 'num' and looping through 'mySet' using the function 'Grep' which flags certain items from mySet. </li> </ol> <p>The 'for' loop works except at the first element '0' of the 'num' object. Consequently, it does not find any item that starts with '0' in mySet.</p> <pre><code>num &lt;- c(0,2,4,6,8,10,15,20,30,40,45,50,55,60,65,70,80,85,90,92,94,96,98,100) mySet &lt;- c("0.C.A", "2.C.A", "4.C.A", "6.C.A", "8.C.A", "10.C.A", "15.C.A", "20.C.A", "30.C.A", "40.C.A", "45.C.A", "50.C.A", "55.C.A", "60.C.A", "65.C.A", "70.C.A", "80.C.A", "85.C.A", "90.C.A", "92.C.A", "94.C.A", "96.C.A", "98.C.A", "100.C.A") varLoop &lt;- c() Grep &lt;- function(num)grep(paste("^" , num, "\\.", sep=""), mySet, value = TRUE) for(i in num){ varLoop[i] &lt;- Grep(i) print(varLoop[i])} </code></pre> <ol> <li>The second issue is an incomplete output and warnings if I modify the script as follows. The warning is: 'number of items to replace is not a multiple of replacement length'. The incomplete out put does not include any of the items ending with the letter B</li> </ol> <p>The script below produces the problem:</p> <pre><code>num &lt;- rep(c(0,2,4,6,8,10,15,20,30,40,45,50,55,60,65,70,80,85,90,92,94,96,98,100), 2) mySet &lt;- c("0.C.A", "2.C.A", "4.C.A", "6.C.A", "8.C.A", "10.C.A", "15.C.A", "20.C.A", "30.C.A", "40.C.A", "45.C.A", "50.C.A", "55.C.A", "60.C.A", "65.C.A", "70.C.A", "80.C.A", "85.C.A", "90.C.A", "92.C.A", "94.C.A", "96.C.A", "98.C.A", "100.C.A", "0.C.B", "2.C.B", "4.C.B", "6.C.B", "8.C.B", "10.C.B", "15.C.B", "20.C.B", "30.C.B", "40.C.B", "45.C.B", "50.C.B", "55.C.B", "60.C.B", "65.C.B", "70.C.B", "80.C.B", "85.C.B", "90.C.B", "92.C.B", "94.C.B", "96.C.B", "98.C.B", "100.C.B") varLoop &lt;- c() Grep &lt;- function(num)grep(paste("^" , num, "\\.", sep=""), mySet, value = TRUE) for(i in num){ varLoop[i] &lt;- Grep(i) print(varLoop[i])} </code></pre> <p>Thank you in advance, Ragy Isaac</p>
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    1. PTQuestion
    1. This table or related slice is empty.
    1. USRagy Isaac
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. COIndexing starts from 1, not 0 http://stackoverflow.com/questions/3135325/why-do-vector-indices-in-r-start-with-1-instead-of-0
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      1. POFor loop ignore my first item
      1. USmnel
    2. CO... Which means that when `varLoop[0] <- Grep(0)` runs, your result won't be stored.
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      1. POFor loop ignore my first item
      1. USSimon MᶜKenzie
 

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