r - merge data frames by character and rowname -


i have 2 data frames this:

set.seed(1) df1 <- data.frame(v1 = rnorm(7),               v2 = c("a1", na, "a2", "a3", "a5", "a6", "a9"))   > df1            v1   v2 1  0.39956187   a1 2  0.33711756 <na> 3 -0.19583763   a2 4  0.04880812   a3 5 -2.07266374   a5 6 -0.83824743   a6 7  1.31302096   a9   df2 <- data.frame(pc1 = rnorm(5),                   pc2 = rnorm(5)) rownames(df2) <- c("a1", "a2", "a3", "a6", "a9")   > df2            pc1         pc2 a1 -0.89865755 -0.32949632 a2 -0.05709327 -0.06923935 a3 -0.44229588  0.32089049 a6 -1.51754734 -0.34285758 a9  0.99955141 -0.62749542

df1 has column v2 contains character values match rownames of df2. has nas , may contains characters no corresponding rownames in df2 exists.

i want merge these data frames one, this:

           v1   v2           pc1         pc2 1  0.39956187   a1   -0.89865755 -0.32949632 2  0.33711756   na            na          na 3 -0.19583763   a2   -0.05709327 -0.06923935 4  0.04880812   a3   -0.44229588  0.32089049 5 -2.07266374   a5            na          na 6 -0.83824743   a6   -1.51754734 -0.34285758 7  1.31302096   a9    0.99955141 -0.62749542

how can this. prefer dplyr (tydiverse) solution.

we can use rownames_to_column create column row names , left_join

library(tidyverse) rownames_to_column(df2, "v2") %>%                    left_join(df1, .)

Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more