Arith-methods {PivotalR} | R Documentation

## Arithmetic Operators for `db.obj` objects

### Description

These binary operators perform arithmetic on `db.obj` objects

### Usage

    ## S4 method for signature 'db.obj,db.obj'
    e1 + e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 - e2
    ## S4 method for signature 'db.obj,ANY'
    e1 - e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 * e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 / e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 %% e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 %/% e2
    ## S4 method for signature 'db.obj,db.obj'
    e1 ^ e2
    ## S4 method for signature 'numeric,db.obj'
    e1 + e2
    ## S4 method for signature 'character,db.obj'
    e1 + e2
    ## S4 method for signature 'numeric,db.obj'
    e1 - e2
    ## S4 method for signature 'character,db.obj'
    e1 - e2
    ## S4 method for signature 'numeric,db.obj'
    e1 * e2
    ## S4 method for signature 'numeric,db.obj'
    e1 / e2
    ## S4 method for signature 'numeric,db.obj'
    e1 %% e2
    ## S4 method for signature 'numeric,db.obj'
    e1 %/% e2
    ## S4 method for signature 'numeric,db.obj'
    e1 ^ e2
    ## S4 method for signature 'db.obj,numeric'
    e1 + e2
    ## S4 method for signature 'db.obj,character'
    e1 + e2
    ## S4 method for signature 'db.obj,numeric'
    e1 - e2
    ## S4 method for signature 'db.obj,character'
    e1 - e2
    ## S4 method for signature 'db.obj,numeric'
    e1 * e2
    ## S4 method for signature 'db.obj,numeric'
    e1 / e2
    ## S4 method for signature 'db.obj,numeric'
    e1 %% e2
    ## S4 method for signature 'db.obj,numeric'
    e1 %/% e2
    ## S4 method for signature 'db.obj,numeric'
    e1 ^ e2

### Arguments

`e1, e2` | numeric or `db.obj` object.

### Value

`db.Rquery` object, which contains the SQL query that computes the arithmetic operations.

### Note

A meaningful expression is generated only when the `.col.data_type` is "numeric", otherwise a "NULL" value is generated.

`"-"` and `"+"` support computing the arithmetic computations between dates, timestamps, times etc.

### Author(s)

Author: Predictive Analytics Team at Pivotal Inc.

Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io

### See Also

`db.Rquery` contains a SQL query that does the operations.

### Examples

    ## Not run:
    ## get the help for a method
    ## help("+,db.obj,db.obj-method")

    ## set up the database connection
    ## Assume that .port is port number and .dbname is the database name
    cid <- db.connect(port = .port, dbname = .dbname, verbose = FALSE)

    ## ----------------------------------------------------------------------

    ## create a table from the example data.frame "abalone"
    delete("abalone", conn.id = cid)
    x <- as.db.data.frame(abalone, "abalone", conn.id = cid, verbose = FALSE)

    x$rings <- (x$rings + 2.3) * 3 # change the values

    x$area <- x$length * x$height # add a new column

    lk(x$area, 10) # view the actual values computed in database

    fit <- madlib.lm(rings ~ area, data = x)

    ## ----------------------------------------------------------------------

    db.disconnect(cid, verbose = FALSE)

    ## End(Not run)

[Package PivotalR version 0.1.18.3.1 Index]