Displaying 20 results from an estimated 145 matches for "dcast".
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2012 Apr 12
1
Using dcast with multiple functions to aggregate
Dear R communitiy,
I am trying to use multiple functions for aggregation within a function
call for dcast. However this seems to result in an error. Also I have not
managed to make dcast() work with fun.aggregate=sd. Please find attached
some example code using the ChickWeight data.
Many thanks for your help!
Jokel
#Chick weight example
names(ChickWeight) <- tolower(names(ChickWeight))
sd(Chic...
2011 Oct 31
1
reshape2: Lost Values Between melt() and dcast()
Working with 5 subset streams from my source data frame, three of them
successfully call dcast(), but two fail:
jerritt.cast <- dcast(jerritt.melt, site + sampdate ~ param)
Aggregation function missing: defaulting to length
and
winters.cast <- dcast(winters.melt, site + sampdate ~ param)
Aggregation function missing: defaulting to length
Yet both data frames have the values in t...
2012 Aug 07
3
reshape2's dcast() Adds NAs to Data Frame
I need to understand how and why dcast() adds NAs to a data frame that
contained no missing values.
The database table of chemical concentrations has all missing values
removed because they cannot contribute to data analyses. The structure of
the R data frame of these data have no NA values, and neither does the data
frame resulting...
2012 Dec 03
2
Excluding all missing values with dcast ("reshape2" package)
Hello--I'm doing a simple crosstab using dcast:
rawfreq <- dcast(nh11brfs, race3~CHCCOPD, length)
with the results
race3 Yes No NA
1 White non-Hispanic 446 5473 21
2 Other non-Hispanic 29 211 0
3 Hispanic 6 81 1
4 <NA> 10 83 1
How would I modify this call to exclude all missing v...
2016 Feb 11
2
Invertir dcast
Hola a todos,
Queria preguntaros si conoceis alguna manera para invertir la funcion dcast. Quiero transformar una matriz en un data frame de tres columnas que indiquen solo los casos donde la combinacion fila-columna sea diferente de NA.
Se me habia ocurrido hacer un bucle que fuera seleccionando todos los valores para cada combinacion de fila y columna, pero el problema es que con una...
2012 Oct 17
1
Comparing dcast and reshape
I'm in the middle of my own little intellectual exercise comparing
dcast() and reshape() and have successfully stumped myself. I want to
melt() a data frame, then dcast() it into a new form. After doing so, I
want to duplicate the process using reshape().
So far, I can do the melt and cast
require(reshape2)
Raw <- data.frame(site = c(1, 1, 1, 1, 2, 2, 2, 2),...
2013 Jan 22
4
Simple use of dcast (reshape2 package)
...1 2
52 TPP 3 3
53 TPP 1 4
54 TPP 2 5
50.1 GPA 9 1
51.1 GPA 11 2
52.1 GPA 8 3
53.1 GPA 8 4
54.1 GPA 10 5
And I want to reshape it into
ID TPP GPA
1 1 0 9
2 2 1 11
3 3 3 8
4 4 1 8
5 5 2 10
I realise that dcast function in the reshape2 package can handle much
more complicated tasks than that, but I can't make it do a simple one.
If I simply tried
> dcast(aa, ... ~ Target)
Using ID as value column: use value.var to override.
Aggregation function missing: defaulting to length
Eaten GPA TPP
1...
2013 Jun 26
1
Error when using median as aggregation function in dcast
Hi,
I am trying to calculated various summary statistics using the dcast
function
of reshape2. This works perfectly for getting the mean, sum, length, sd. But
when I want to calculate the median I get an error. I tried it with and
without removing
NAs:
my_median <- function(x) median(x, na.rm = FALSE)
median_df <- dcast(patch_stats_dfm,formula=species~input+barri...
2016 Feb 11
4
Invertir dcast
...8
>
Un saludo. Olivier
----- Mensaje original -----
De: "Javier Marcuzzi" <javier.ruben.marcuzzi en gmail.com>
Para: "Ruben Bermad" <ruben_bm en hotmail.com>, r-help-es en r-project.org
Enviados: Jueves, 11 de Febrero 2016 12:45:02
Asunto: Re: [R-es] Invertir dcast
Estimado Ruben Bernard
¿Usted desea algo como sparce matrix?
Javier Rubén Marcuzzi
De: Ruben Bermad
Enviado: jueves, 11 de febrero de 2016 9:40
Para: r-help-es en r-project.org
Asunto: [R-es] Invertir dcast
Hola a todos,
Queria preguntaros si conoceis alguna manera para invertir la funcion dc...
2011 Dec 12
0
using dcast to reshape a DF from long to wide with multiple measured variables per obs
..."fillno2_v3", "fillno3_v2",
"fillno3_v3", "fillno4_v2", "fillno4_v3", "fillno5_v2", "fillno5_v3",
"fillno6_v2", "fillno6_v3"), class = "data.frame", row.names = c(NA,
-3L))
I have tried melt and dcast, but can only get reshape to organize by one measured variable at a time (and not two, as I would like).
For example, the following organizes my data by fill-number and v2:
dcast(DF, person ~ fillno, value.var=c("v2"))
likewise the following works for v3
dcast(DF, person ~ fillno,...
2012 Jul 24
3
Simple reshape problem I am completely missing
...hat?
I have a simple three column data.frame that I would like to reshape to wide preferably using reshape2.
An example from http://stackoverflow.com/questions/9617348/reshape-three-column-data-frame-to-matrix looked perfect except I wanted a data frame but it seemed okay. I just changed acast to dcast and it seems fine.
Stackoverflow example:
tmp <- data.frame(x=gl(2,3, labels=letters[24:25]),
y=gl(3,1,6, labels=letters[1:3]),
z=c(1,2,3,3,3,2))
dd <- dcast(tmp, x~y, value.var="z")
My Example: Does NOT work
md2 <- structure(list(group...
2012 Mar 19
0
Reshape data frame with dcast and melt
...collapse="+")))
data_long <- sort(data_long, f = formula_sort)
return(data_long)
}
reshape_wide <- function(data, ids) {
# Bring data into wide form
formula_wide <- as.formula(paste(paste(ids, collapse="+"), "~
Data_Points"))
data_wide <- dcast(data, formula_wide)
# Resort data
formula_sort <- as.formula(paste("~", paste(ids, collapse="+")))
data_wide <- sort(data_wide, f = formula_sort)
return(data_wide)
}
d <- data.frame(
test_name = c(rep("Test_A", 6), rep("Test_B",...
2013 Jun 26
1
Margins in dcast (reshape2)
Hi,
I'd like to get mean values for the margins of my casted data.frame.
For the casting I am using dcast() from reshape2. However, when I set
the margins parameter (margins=c("grand\_row")) I get following error
concerning
an unrecognized escape character '\_'. So what is the correct command
to get the outermost margins only in reshape2?
/johannes
[[alternative HTML version delete...
2011 Sep 28
3
Data transformation & cleaning
...ID | Page
123 | Choice A
123 | Choice B
456 | Choice A
456 | Choice B
...
I thought that I should do the following
1. Make the data set "wide", counting the observations so the data looks
like this:
ID | Count of Preference A | Count of Preference B
123 | 1 | 1
...
Using
table1 <- dcast(data,ID ~ Page,fun.aggregate=length,value_var='Page' )
2. Create a correlation matrix of preferences
cor(table2[,-1])
How would I restrict my correlation to show preferences that met a minimum
sample threshold? Can you confirm if the two following commands do the same
thing? What would I...
2012 Jul 05
1
reshape2 errors on data frame
I've successfully reformatted data frames from long to wide with reshape2,
but this time I'm getting errors that I want to understand and resolve.
Here's the data frame structure and the results of the melt() and dcast()
functions:
str(waterchem)
'data.frame': 128412 obs. of 8 variables:
$ site : Factor w/ 64 levels "D-1","D-2","D-3",..: 1 1 1 1 1 1 1 ...
$ sampdate: Date, format: "2007-12-12" "2007-12-12" ...
$ preeq0 : logi TRUE TRUE TRUE TR...
2011 Sep 09
4
reshape data from long to wide format
...uot;1", "2", "3", "4",
"5", "6"))
I need to resahpe "example" in a wide format so that ?SENSOR? appear as
columns and ?DATE? as rows with corresponding ?VALUE? as value;
I thought it was very simple so that I?ve been trying this:
dcast(example,DATE~SENSOR)
But I've got this message:
Using DATE as value column. Use the value argument to cast to override this
choice
Errore in `[.data.frame`(data, , variables, drop = FALSE) :
undefined columns selected
and even if by using the value argument sorted out any good result?
s...
2016 Sep 03
2
Pivot tables con data.table
Muchas gracias, pensaba hacerlo en una sola línea pero no anda.
Me quedo con dcast así no tengo que cargar más paquetes.
Un abrazo!
Fernando Macedo
El 03/09/16 a las 14:26, Carlos J. Gil Bellosta escribió:
> reshape2 + dcast
>
> El día 3 de septiembre de 2016, 19:23, Fernando Macedo
> <fermace en gmail.com> escribió:
>> Buenas, estoy intentando hacer un...
2012 Jul 25
2
reshape -> reshape 2: function cast changed?
...1) Melt a dataframe based on a vector specifying column names as measure.vars. Thats working so far:
dfm <- melt(df, measure.vars=n, variable_name = "species", na.rm = FALSE)
2) Recast the dataframe:
dfc <- cast(dfm, Var1 + Var2 + Var3 + Var4 ~ species,max) # with reshape
dfc <- dcast(dfm, Var1 + Var2 + Var3 + Var4 ~ species,max) # with reshape2
but then I get (this is new to reshape2!) a warning message:
In .fun(.value[0], ...) : no non-missing arguments to max; returning -Inf
The result seems to be similar (but I haven't checked it yet properly)? A message to ignore?
I...
2018 Feb 25
4
reshaping column items into rows per unique ID
...ID DietType DietType DietType
1 a c b
2 f a
3 j
4 c c f
I tried many times using melt(),spread (),and dcast () functions but was not able to produce the desired table. The best attempt was by typing :
# 1) Adding new column with unique values:
MyDf $newcol <- c (1:9)
#2) then :
NewDf <- dcast (MyDf,CustomerID~newcol,value.var=DietType)
This produces the desired table but with many NA values like...
2012 Nov 17
3
Reshaping a dataframe
Seems like this should be easy but I'm struggling a bit. How do I rearrange a
data frame to go from the first one to the second shown below ?
State Date lbs
TX 200701 400
TX 200702 650
TX 200703 950
TX 200704 1000
FL 200701 200
FL 200702 300
FL 200703 500
FL 200704 333
NJ 200701 409
NJ 200702 308
NJ 200703 300
NJ 200704 800
Date TX FL NJ
200701 400 200 409
200702 650