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$MachinePrecision
Precision
Accuracy
N
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MachinePrecision
MachinePrecision
is a symbol used to indicate machine-number precision.
MORE INFORMATION
The numerical value of
MachinePrecision
is
$MachinePrecision
.
Precision
[1.]
gives
MachinePrecision
.
MachinePrecision
is the default specification for precision in
N
and other numerical functions.
Approximate real numbers are assumed to have precision specified by
MachinePrecision
if fewer than
$MachinePrecision
explicit digits are entered.
The option setting
WorkingPrecision
->MachinePrecision
specifies that internal computations in numerical functions should be done with machine numbers.
MachinePrecision
is treated as a numeric constant, with attribute
Constant
.
EXAMPLES
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Basic Examples
(2)
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MachinePrecision
is treated as an exact numeric quantity:
In[1]:=
Out[1]=
Use like any number:
In[2]:=
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In[3]:=
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The number of bits represented:
In[4]:=
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Scope
(2)
Applications
(3)
Properties & Relations
(4)
SEE ALSO
$MachinePrecision
Precision
Accuracy
N
TUTORIALS
Numerical Precision
MORE ABOUT
Precision & Accuracy Control
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© 2008 Wolfram Research, Inc.
EXAMPLES
Basic Examples 
Scope 