search for: qti

I have a method: ? def reduceProuctInventoryBy(product_id, reduction) ? ? t=Product.find(:first, :conditions =>["id = ?", product_id]) ? ? t.qty=(t.qty-reduction) ? ? t.save ? end and the model: class Product < ActiveRecord::Base ? validates_presence_of :qty, :specialDescription ? validates_numericality_of :qty end but when i run my method, I get this: "can''t

Hello List! Thank you for your input so far. I have successfully imported my data into R but have hit a snag in plotting. Simple plot commands are unable to find my headers when I try and plot my data on an x/y scatter. My data is a 2 column 8000 row table (saved as .txt file) imported into R. >demand=read.delim("C:\\Documents and Settings\\E066582\\My

With this example set.seed(123) A <- matrix(runif(40), nrow = 8) y <- 1:nrow(A) A.laqr <- qr(A, LAPACK=TRUE) both qr.qy(A.laqr,y) and qr.qty(A.laqr,y) give the respective error messages Error in qr.qy(A.laqr, y) : 'b' must be a numeric matrix Error in qr.qty(A.laqr, y) : 'b' must be a numeric matrix However when Lapack is not used as in A.liqr <- qr(A,

Dear R people, I do not have much knowledge about linear algebra but currently I need to understand what the function qr.qty is actually doing. The documentation states that it calculates t(Q) %*% y via a previously performed QR matrix decomposition. In order to do that, I tried following basic example: m<-matrix(c(1,0,0,0,1,0,0,0,1,0,0,1),ncol=3) # 4x3 matrix

I am having some difficulty understanding the implication of lazy evaluation mixed with DUP=F in a .Fortran call. In qr.qty from base DUP is not used as an argument so defaults to T. I am calling qr.qty with a very large array and would like to set DUP=F in the .Fortran call so that qr.qty would be defined as copied below. Is there some risk that a variable used as the argument in the original

Hi, I couldn''t find a better word for pop, but let''s go: There are 3 models: sale, pop and product sale: -total:integer pop: -quantity:integer -discount:float product: -name:string -price:float A sale can have many different products, each one has a quantity and discount associated. So each sale has_many :products through => pops And each product has_many :sales

I think there are two bugs in aov() that shows up when the right hand side of `formula' contains both `-1' and an Error() term, e.g., aov(y ~ a + b - 1 + Error(c), ...). Without `-1' or `Error()' there is no problem. I've included and example, and the source of aov() with suggested fixes below. The first bug (labeled BUG 1 below) creates an extra, empty stratum inside

I tried command as.numeric(Qty) #converting column"Qty" in object "demand" to numeric. However it remains a non-numeric value. What is the best way to convert a column of data to a numeric value in R? What is the best way to convert dates into a numeric format (or some format able to be used in an x,y scatter) while still maintaining its inherent "date" property?

I believe you are right, but can you please explain why anyone would want to fit this model? It differs only in the coding from aov(y ~ a + b + Error(c), data=test.df) and merely lumps together the top two strata. There is a much simpler fix: in the line if(intercept) nmstrata <- c("(Intercept)", nmstrata) remove the condition (and drop the empty stratum later if you

The man page for se.contrast, when describing the contrast.obj parameter, states that "Multiple contrasts should be specified by a matrix as returned by contrasts." When doing an unbalanced single factor ANOVA, using a contrast.obj as returned by contrasts results in the following error from qr.qty when se.contrast is called: Error in qr.qty(object$qr, contrast) : qr and y must have

Hi, I''m creating a list of ingredients on a page. When the user clicks the ''Add Ingredient'' button a record gets added to the db and the ingredient gets added to the page. On the page, each record is represented by a <div> with three <span>s inside. One of the <span>s has a link_to_remote to ''delete'' the ingredient. When the link

-----Original Message----- From: Struckmeier, Nathanael Sent: Friday, May 27, 2011 1:39 PM To: 'stephen's mailinglist account' Subject: RE: [R] Unable to Plot using headers. Thanks for the input. Despite both graphing directly and with "attach" I am still getting a screwed up graphical output as well as an error. My table is object "demand" w/ columns Date and

Hi all, I''ve the following test method in my controller_test which increment the ''qty'' attribute in a has_many association, ''sa_report_products''. The ''item_count'' method returns the sum of all qty''s in ''sa_report_products'': def test_add_product_to_report sa_rpt = SaReport.find(1) assert_equal 3,

I use sqldf to join 2 dataframes from 2 distinct databases : a and b come from old sqldf's. sqldf("select a.*, b.*, case a.QTY when null then b.QTY else a.QTY end as NEW_QTY" from a inner join b on a.OBJECT=b.OBJECT") R doesn't understand "when null". I tried with "when NA", "when '' ", "when ' ' " but it doesn't

i have this model: class LineItem < ActiveRecord::Base belongs_to :quote end in the console: >>l = LineItem.create ActiveRecord::StatementInvalid: Mysql::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' , , , )'' at line 1: INSERT INTO line_items (`qty`, `quote_id`,

Let's say you have a dataframe of car trade-ins. For example, each row contains oldcar newcar qty and a typical entry could be lexus bmw 1 I put the qty column to allow for fleet purchases, where one purchase may convert multiple cars at once. I'd like to show what's going on. I could do a histogram of newcar to show the frequency each type of car is bought. If there

Hi list, I tried to use nls to do some nonlinear least square fitting on my data with 340 observations and 10 variables, but as I called nls() function, I got this error message: Error in qr.qty(QR, resid) : 'qr' and 'y' must have the same number of rows Then I traced back a little bit into nls() function, the error seemed to happen when calling nlsiter() internal function, but

Hi all, Regular and avid readers of this column will know that Don Driscoll and I have recently posted two messages requesting assistance concerning an apparent failure of "se.contrast" to produce an se for a contrast. So far, an ominous silence rings in our ears, but read on Gentle Reader, and see if even the machinations of "debug" doesn't stimulate you to respond with a

hi, I have json string in json request. i want to update the database using that string. how can i do that? There would be a multipal object in this string. sample string is:

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,