Databases
StackOverflow2013
Postsdbo
POUsing paste to write a loop in R?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUsing paste to write a loop in R?
    primarykey
    data
    text
    <p>I'm trying to write this piece of code using a for loop.</p> <pre><code>#Took Quiz X and 1 TookQuizX[1,1] &lt;- nrow(Q1[Q1$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[2,1] &lt;- nrow(Q2[Q2$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[3,1] &lt;- nrow(Q3[Q3$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[4,1] &lt;- nrow(Q4[Q4$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[5,1] &lt;- nrow(Q5[Q5$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[6,1] &lt;- nrow(Q6[Q6$anon_user_id %in% Q1$anon_user_id,]) </code></pre> <p>What I tried is the following</p> <pre><code>for(i in 1:6){ Qx&lt;-paste("Q",i,"[Q",i,"$anon_user_id",sep="") TookQuizX[i,1] &lt;- nrow(Qx %in% Q1$anon_user_id,]) } </code></pre> <p>When I run my loop I get the following error: </p> <pre><code>Error: unexpected ']' in: " Qx&lt;-paste("Q",i,"[Q",i,"$anon_user_id",sep="") TookQuizX[i,1] &lt;- nrow(Qx %in% Q1$anon_user_id,]" &gt; } Error: unexpected '}' in "} </code></pre> <p>What am I doing wrong?</p> <p>Thanks!</p> <hr> <p>This very simple example hopefully illustrates what i'm trying to do</p> <pre><code>TookQuizX &lt;- matrix(data=NA,nrow=3,ncol=1) Q1 &lt;- data.frame(anon_user_id = c("A123", "A111", "A134", "A156"), other_stuf=999) Q2 &lt;- data.frame(anon_user_id = c("A123", "A234", "A111", "A256", "C521"), other_stuf=999) Q3 &lt;- data.frame(anon_user_id = c("A123", "A234", "A111", "A356", "B356"), other_stuf=999) TookQuizX[1,1] &lt;- nrow(Q1[Q1$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[2,1] &lt;- nrow(Q2[Q2$anon_user_id %in% Q1$anon_user_id,]) TookQuizX[3,1] &lt;- nrow(Q3[Q3$anon_user_id %in% Q1$anon_user_id,]) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USIgnacio
    1. USIgnacio
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYour main mistake is using a `for` loop. Please make your question [reproducibly](http://stackoverflow.com/a/5963610/1412059) to enable us to show you alternatives.
      singulars
      1. POUsing paste to write a loop in R?
      1. USRoland
    2. COOf course the first comment @Roland would be condescension rather than something helpful. Ignacio, `i <- 1` and go through your loop line-by-line to see what it is actually doing.
      singulars
      1. POUsing paste to write a loop in R?
      1. USrawr
    3. CO@rawr It's not condescension, but honest advice. I might even have shown a far better alternative, if the OP provided example data. But without data I cannot test ...
      singulars
      1. POUsing paste to write a loop in R?
      1. USRoland
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload