On Wed, 1 Jun 2005, luan_sheng wrote:
hello,everyone. I have one question:
example 1
x=numeric(0)
y=5
print(x+y)
numeric(0)
example 2
x=numeric(1)
y=5
print(x+y)
[1] 5
why the print(x+y) is numeric(0) at the first example, but the result is 0
at the second example?
numeric(0) is a zero-length vector of floating point numbers, so your
first example takes no floating point numbers and adds 5 to each one. The
result is still no floating point numbers.
numeric(1) is a vector containing a single 0, so the second example takes
0 and adds 5, to give a vector containing a single 5.
-thomas
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