Re: [R] help with reshape

Ivan Calandra Tue, 08 Sep 2015 05:19:41 -0700

Thank you Petr,

It kinda works, but not completely. The problem is that it produces acolumn for each value ("Moyenne"), and not each element of "Elem". Thatmeans I have only one value per column, instead of up to 3.For example, I have 3 columns for Al1670 instead of just one, and eachcolumn contains maximum one value (the others being NA).


Not sure I am being clear...

By the way, I don't understand why my solution did not work; what iswrong there?


Thank you again!
Ivan

--
Ivan Calandra, PhD
University of Reims Champagne-Ardenne
GEGENAA - EA 3795
CREA - 2 esplanade Roland Garros
51100 Reims, France
+33(0)3 26 77 36 89
ivan.calan...@univ-reims.fr
https://www.researchgate.net/profile/Ivan_Calandra

Le 08/09/15 14:04, PIKAL Petr a écrit :

Hi

I am not sure if I got it

library(reshape2)
mm<-melt(mydata, measure.vars="Moyenne")
test <- dcast(mm, Etape+Ech+repet+dilution+Rincage~Elem+value)

gives me 3 rows but names need some tweaking afterwards.

nn<-paste("Moyenne", unlist(lapply(strsplit(names(test)[-(1:5)], "_"), "[", 1)), 
sep=".")
names(test)[-(1:5)]<-nn

Cheers
Petr

-----Original Message-----
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Ivan
Calandra
Sent: Tuesday, September 08, 2015 12:33 PM
To: R list
Subject: [R] help with reshape

Dear users,

I'm having troubles with reshaping a data.frame from long to wide
format.
I copy the output of dput() at the end of the mail because it is quite
long.

Each row of the column "Elem" should be transposed to a new column. All
variables "Etape", "Ech", "repet", "dilution", "Rincage" define the
samples. Meaning that for each unique combination of these variables, I
want a single row, and as many columns as elements in "Elem".

So I tried:
reshape(mydata, timevar="Elem",
idvar=c("Etape","Ech","repet","dilution","Rincage"), direction="wide",
drop=c("ID","Nom_ech"))

The problem is that some columns are not used at all for defining
samples. In this case, the row "S1, F10-3, NA, 1, oui" is missing, but
I don't understand why.

Can you help me with that? I have no idea what I am doing wrong...

Thanks in advance,
Ivan



mydata <- structure(list(ID = c(543, 544, 545, 546, 547, 548, 549, 550,
551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 11574,
11575, 11576, 11577, 11578, 11579, 11580, 11581, 11582, 11583, 683,
684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697,
698, 699, 700, 701, 702), Nom_ech = c("Step1 B2", "Step1 B2",
"Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2",
"Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2",
"Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2", "Step1 B2",
"R1 S1 F1 0-3", "R1 S1 F1 0-3", "R1 S1 F1 0-3", "R1 S1 F1 0-3",
"R1 S1 F1 0-3", "R1 S1 F1 0-3", "R1 S1 F1 0-3", "R1 S1 F1 0-3",
"R1 S1 F1 0-3", "R1 S1 F1 0-3", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1)
*100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100",
"S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100", "S1 F1 0-3 (1) *100"
), Etape = c("S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1",
"S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1",
"S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1",
"S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1", "S1",
"S1", "S1", "S1", "S1", "S1"), Ech = c("B2", "B2", "B2", "B2", "B2",
"B2", "B2", "B2", "B2", "B2", "B2", "B2", "B2", "B2", "B2", "B2", "B2",
"B2", "B2", "B2", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3",
"F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3",
"F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3",
"F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3", "F10-3"
), repet = c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1), dilution = c(1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100, 100), Rincage = c("non", "non",
"non", "non", "non", "non", "non", "non", "non", "non", "non", "non",
"non", "non", "non", "non", "non", "non", "non", "non", "oui", "oui",
"oui", "oui", "oui", "oui", "oui", "oui", "oui", "oui", "non", "non",
"non", "non", "non", "non", "non", "non", "non", "non", "non", "non",
"non", "non", "non", "non", "non", "non", "non", "non"), Elem =
c("Al1670", "As1890", "As1937", "Ca1840", "Ca3158", "Cd2288", "Co2286",
"Co2378", "Cr2055", "Cr2835", "Cu2247", "Cu3247", "Fe2382", "Fe2599",
"K_7664", "Mg2795", "Mg2852", "Mn2576", "Mn2605", "Ni2216", "Al1670",
"As1890", "As1937", "Ca1840", "Ca3158", "Cd2288", "Co2286", "Co2378",
"Cr2055", "Cr2835", "Al1670", "As1890", "As1937", "Ca1840", "Ca3158",
"Cd2288", "Co2286", "Co2378", "Cr2055", "Cr2835", "Cu2247", "Cu3247",
"Fe2382", "Fe2599", "K_7664", "Mg2795", "Mg2852", "Mn2576", "Mn2605",
"Ni2216"), Moyenne = c(NA, NA, 3.7455, 596.166666666667, 578.2, 0.1514,
NA, 1.87225, NA, 0.3664, 1.859, 1.96766666666667, NA, NA,
9.29566666666667, 13.08, 12.69, 0.26875, 0.2877, 0.2395,
5732.33333333333, 3.9615, 3.48833333333333, 337.433333333333,
323.533333333333, 0.877166666666667, 0.292466666666667, NA,
1.79566666666667, NA, 106.326666666667, NA, 2.2755, 291.933333333333,
278.833333333333, 0.819, NA, 3.946, NA, NA, 1.47766666666667,
1.63266666666667, 40.44, 40.2533333333333, 128.9, 50.11, 49.02,
37.4733333333333, 37.775, 0.3764)), .Names = c("ID", "Nom_ech",
"Etape", "Ech", "repet", "dilution", "Rincage", "Elem", "Moyenne"),
row.names = c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L,
14L, 15L, 16L, 17L, 18L, 19L, 20L, 29L, 30L, 31L, 32L, 33L, 34L, 35L,
36L, 37L, 38L, 112L, 113L, 114L, 115L, 116L, 117L, 118L, 119L, 120L,
121L, 122L, 123L, 124L, 125L, 126L, 127L, 128L, 129L, 130L, 131L ),
class = c("tbl_df", "tbl", "data.frame"))

--

Ivan Calandra, PhD
University of Reims Champagne-Ardenne
GEGENAA - EA 3795
CREA - 2 esplanade Roland Garros
51100 Reims, France
+33(0)3 26 77 36 89
ivan.calan...@univ-reims.fr
https://www.researchgate.net/profile/Ivan_Calandra

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Re: [R] help with reshape

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