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N1

n1 is a label used in mathematics, computer science, statistics, and related fields to denote a first index, a component of a partition, or a dimension of a structure. There is no universal definition for n1; its meaning depends on the context and the surrounding notation.

In mathematics and computing, n1 often appears as an index or as the size of the first

In statistics and data analysis, n1 and n2 may denote the sizes of two partitions of a

In other contexts, n1 is simply a generic parameter name. Capitalized variants like N1 are used in

See also: N1, n2, subscript notation.

dimension
of
a
multi-dimensional
object.
For
example,
in
a
two-dimensional
array
with
dimensions
n1
by
n2,
n1
can
denote
the
length
of
the
first
axis,
or
the
lower
bound
or
starting
index
of
a
subrange
within
a
larger
index
set.
It
is
common
to
see
n1
paired
with
n2
to
describe
a
Cartesian
product,
a
matrix
size,
or
a
split
of
an
index
range.
dataset,
such
as
when
performing
a
split
for
validation,
training
and
testing,
or
cross-validation.
In
such
cases
n1
+
n2
often
equals
the
total
sample
size
n.
some
domains
to
distinguish
different
kinds
of
quantities,
for
example
in
engineering
or
physics
where
N1
might
indicate
a
separate,
related
quantity.