Displaying 20 results from an estimated 7000 matches similar to: "Help summarizing R data frame"
2011 Jan 18
1
Reorganizing Data Frame
Hi I need some help trying to restructure a data frame:
I have:
food transaction quantity
pizza BUY 5
pizza SELL 3
apple BUY 2
orange SELL 1
pizza BUY 2
And the data frame I want to make is:
food BUY SELL
pizza 7 3
apple 2 0
2011 Mar 16
3
Reorganize data frame
Hi group,
I am trying to convert the organization of a data frame so I can do some
correlations between stocks,
I have something like this:
stock.returns <-
data.frame(rbind(c("MSFT","20110301",0.05),c("MSFT","20110302",0.01),c("GOOG","20110301",-0.01),c("GOOG","20110302",0.04)))
colnames(stock.returns) <-
2010 May 26
2
writing function : can't find an object
Dear group,
Here is my function:
#return the daily PL for day y
PLDaily<-function(x,y)
{
#find elements in my directory with "LSCPos" in the name, keep the numeric
part in the name and
#create a list
l<-gsub("\\D","",dir()[grep("LSCPos",dir())])
#select in the list the desired elements
2010 Jun 01
1
data frame manipulation ddply
Dear group,
Here is my data frame:
futures <-
structure(list(DESCRIPTION = c("CORN Jul/10", "CORN Jul/10",
"CORN Jul/10", "CORN Jul/10", "CORN Jul/10", "LIVE CATTLE Aug/10",
"LIVE CATTLE Aug/10", "SUGAR NO.11 Jul/10", "SUGAR NO.11 Jul/10",
"SUGAR NO.11 Jul/10", "SUGAR NO.11
2010 Jun 01
1
data frame manipulation with zero rows
Dear group,
Here is the kind of data.frame I obtain every day with my function :
futures <-
structure(list(DESCRIPTION = c("CORN Jul/10", "CORN Jul/10",
"CORN Jul/10", "CORN Jul/10", "CORN Jul/10", "LIVE CATTLE Aug/10",
"LIVE CATTLE Aug/10", "SUGAR NO.11 Jul/10", "SUGAR NO.11 Jul/10",
"SUGAR
2011 Jan 26
2
hwo to speed up "aggregate"
I have
> df
quantity branch client date name
1 10 1 1 2010-01-01 one
2 20 2 1 2010-01-01 one
3 30 3 2 2010-01-01 two
4 15 4 1 2010-01-01 one
5 10 5 2 2010-01-01 two
6 20 6 3 2010-01-01 three
7 1000 1 1 2011-01-01 one
8 2000 2 1 2011-01-01
2008 Nov 17
5
how to calculate another vector based on the data from a combination of two factors
Hi,
I have a data set similar to the following
State Gender Quantity
TX Male 1
NY Female 2
TX Male 3
NY Female 4
I need to calculate cumulative sum of the quantity by State and Gender. The
expected output is
State Gender Quantity CumQuantity
TX Male 1 1
TX Male 3 4
NY Female 2 2
NY Female 4 6
I highly appreciate if someone can give me some hints on solving that in R.
Hao
--
View this
2010 Apr 27
1
save a data frame in environment
Dear group,
Here is my function :
position<-function(x)
{
pose<-read.csv2((paste(c("LSCPos",x,".csv"),collapse="")),dec=".",sep=",",as
.is=T,h=T,skip=1)[,c(4,8,14,15)]
pose$CREATED.DATE<-as.Date(pose$CREATED.DATE,"%d/%m/%y")
futures<-pose[-grep("USD",pose[,1]),]
2011 Oct 23
4
summarizing a data frame i.e. count -> group by
Hello,
This is one problem at the time :)
I have a data frame df that looks like this:
time partitioning_mode workload runtime
1 1 sharding query 607
2 1 sharding query 85
3 1 sharding query 52
4 1 sharding query 79
5 1 sharding query 77
6 1 sharding query 67
7 1
2011 Mar 10
1
How to use conditional statement
Dear R helpers
Suppose
val1 = c(10, 20, 35, 80, 12)
val2 = c(3, 8, 11, 7)
I want to select either val1 or val2 depending on value of third quantity val3.
val3 assumes either of the values "Monthly" or "Yearly".
If val3 = "Monthly", then val = val1 and if val3 = "Yearly", then val = val2.
I tried the ifelse statement as
ifelse(val3 =
2010 Apr 14
6
sum specific rows in a data frame
I have a data frame called "pose":
DESCRIPTION QUANITY CLOSING.PRICE
1 WHEAT May/10 1 467.75
2 WHEAT May/10 2 467.75
3 WHEAT May/10 1 467.75
4 WHEAT May/10 1 467.75
5 COTTON NO.2 May/10 1 78.13
6 COTTON NO.2 May/10 3 78.13
7 COTTON NO.2 May/10 1 78.13
2011 Apr 13
1
error for ttest
Hello all,
I have arranged my data as per Dennis's suggestion in this post
http://www.mail-archive.com/r-help at r-project.org/msg107156.html.
the posted code works fine but when I try to apply it to my data, i get ">
u2 <- ddply(xxm, .(plateid, cytokine), as.data.frame.function(f))
Error in t.test.formula(conc ~ Self_T1D, data = df, na.rm = T) :
grouping factor must have
2005 Jan 26
1
summarizing daily time-series date by month
Message: 63
Date: Wed, 26 Jan 2005 04:28:51 +0000 (UTC)
From: Gabor Grothendieck <ggrothendieck at myway.com>
Subject: Re: [R] chron: parsing dates into a data frame using a
forloop
To: r-help at stat.math.ethz.ch
Message-ID: <loom.20050126T052153-333 at post.gmane.org>
Content-Type: text/plain; charset=us-ascii
Benjamin M. Osborne <Benjamin.Osborne <at> uvm.edu>
2007 Jan 05
4
How To Spec Controllers with Finders
Given this code (which renders rjs), I''m faced with the fixture-
driven way of spec-ing or mocking. How the heck to you mock this so
the code at line (2) and (4) work right? I''m still struggling with
mocks but it seems like this can be done. Forgive the naivety of this
question.
1. def change_quantity
2. @line_item = LineItem.find_by_id(params[:id])
3. unless
2010 Apr 28
3
data frame move columns
Dear group,
Here is my df:
avprix <-
structure(list(DESCRIPTION = c("CORN Jul/10", "CORN May/10",
"ROBUSTA COFFEE (10) Jul/10", "SOYBEANS Jul/10", "SPCL HIGH GRADE ZINC USD",
"STANDARD LEAD USD"), prix = c(-1.5, -1082, 11084, 1983.5, -2464,
-118), quantity = c(0, -3, 8, 2, -1, 0), fees = c(-8.64, -30.24,
-26.4, -25.92, -37.5,
2008 Jun 04
2
Mock with an attributes that has state
I''m developing a rails application. I have an Order model that has_many
OrderItems.
I mocked the OrderItem model in my Order specs using mock_model. I thought
I should focus my specs on each model and always mock associated models.
In my Order model I need a way to merge OrderItems which have the same cost
and same product_id. That I can spec.
The other thing this merge helper
2005 Dec 14
9
Passing quantity in a shopping cart
I am using this line on my index.rhtml page to capture the quantity
required of a particular item for a basic shopping cart app:
<%= text_field ''line_item'', ''quantity'', {:size=>3} %> </td>
but my next screen (a cart screen) doesn''t reflect what was entered in
that text field when the item is added to the cart. That is,
2006 Apr 24
3
Form with multiple rows of content
I have looked at examples for this. I found a similar example in the
Agile Web Dev... book but that didn''t help. Here''s what i am trying to
do.
A Cart has many line items. On the Display Cart page, I want to provide
the user the option to update quantities.
Here''s the rhtml code:
<%= start_form_tag :action => ''update_cart'' %>
2006 May 25
2
Best way to validate an integer field?
I am trying to validate an integer field called quantity. I don''t know
how to chack if it has gone beyond or below the maximum or minimum value
allowed by the Firebird RDBMS. I tired adding this code to the validate
method in the model:
if (quantity > -2147483648) and (quantity < 2147483648)
errors.add("quantity", "is out of range (must be between
2008 Oct 24
4
Railscast 75, Observe_field and Shopping Cart
Hi all,
I have the shopping cart page where a user can add items dynamically
through ajax as explained in Railscast episode 75. I am using
observe_field to observe the ''quantity'' and ''cost'' fields to update
the total field for each item.
This does not work however, for records that are added through the
Ajax. How can i name the fields and observe them as i have