rmongodb (version 1.8.0)

mongo.bson.buffer.append.double: Append a double field onto a mongo.bson.buffer

Description

Append a double or vector of doubles onto a mongo.bson.buffer.

Usage

mongo.bson.buffer.append.double(buf, name, value)

Arguments

buf

(mongo.bson.buffer) The buffer object to which to append.

name

(string) The name (key) of the field appended to the buffer.

value

(double vector) The values(s) to append to the buffer.

If value has a dims attribute of length > 1, any names or dimnames attribute is ignored and a nested array is appended. (Use mongo.bson.buffer.append.object() if you want to preserve dimnames).

If value has a names attribute, a subobject is appended and the subfields are given the indicated names.

Otherwise, if more than one element is present in value, the values are appended as a subarray.

In the last case, a single as.double is appended as the value of the field.

Value

TRUE if successful; otherwise, FALSE if an error occured appending the data.

See Also

mongo.bson, mongo.bson.buffer, mongo.bson.buffer.append.

Examples

buf <- mongo.bson.buffer.create()
mongo.bson.buffer.append.double(buf, "YearSeconds",
     365.24219 * 24 * 60 * 60)
b <- mongo.bson.from.buffer(buf)

# The above produces a BSON object of the form:
# { "YearSeconds" : 31556925.2 }

buf <- mongo.bson.buffer.create()
mongo.bson.buffer.append.double(buf, "dbls",
    c(1.7, 87654321.123, 12345678.321))
b <- mongo.bson.from.buffer(buf)

# The above produces a BSON object of the form:
# { "dbls" : [1.7, 87654321.123, 12345678.321] }

buf <- mongo.bson.buffer.create()
fractions <- c(0.5, 0.25, 0.333333)
names(fractions) <- c("Half", "Quarter", "Third")
mongo.bson.buffer.append.double(buf, "Fractions", fractions)
b <- mongo.bson.from.buffer(buf)

# The above produces a BSON object of the form:
# { "Fractions" : { "Half"    : 0.5,
#                   "Quarter" : 0.25,
#                   "Third"   : 0.333333 } }