Euler numbers and polynomials
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euler(n
) euler(n
,x
)
euler(n)
returns the nth
Euler number.
euler(n, x)
returns the nth
Euler polynomial in x.
The Euler polynomials are defined by the generating function
.
The Euler numbers are defined by euler(n)
= 2^n*euler(n,1/2)
.
An error occurs if n
is a numerical value
not representing a nonnegative integer.
If n
is an integer larger than the value
returned by Pref::autoExpansionLimit
(),
then the call euler(n)
is returned symbolically.
Use expand(euler(n))
to get an explicit numerical
result for large integers n
.
If n
contains nonnumerical symbolic identifiers,
then the call euler(n)
is returned symbolically.
In most cases, the same holds true for calls euler(n, x)
.
Some simplifications are implemented for special numerical values
such as x = 0
, x = 1/2
, x
= 1
etc. for symbolic n
. Cf. Example 3.
Note: Note that floatingpoint evaluation for high degree polynomials may be numerically unstable. See Example 4. 
The floatingpoint evaluation on the standard interval x ∈
[0, 1] is numerically stable for arbitrary n
.
To use the Euler constant, call E
or exp(1)
.
To use the EulerMascheroni constant, call EULER
.
See Mathematical Constants Available in MuPAD.
You can approximate these constants with floatingpoint numbers by
using float
.
When called with a floatingpoint value x
,
the function is sensitive to the environment variable DIGITS
which
determines the numerical working precision.
The first Euler numbers are:
euler(n) $ n = 0..11
The first Euler polynomials:
euler(n, x) $ n = 0..4
If n
is symbolic, then a symbolic call is
returned:
euler(n, x), euler(n + 3/2, x), euler(n + 5*I, x)
If x
is not an indeterminate, then the evaluation
of the Euler polynomial at the point x
is returned:
euler(50, 1 + I)
euler(3, 1  y) = expand(euler(3, 1  y))
Certain simplifications occur for some special numerical values
of x
, even if n
is symbolic:
euler(n, 0), euler(n, 1/2), euler(n, 1)
Calls with numerical arguments between and 1 are automatically rewritten in terms of calls with arguments between 0 and :
euler(n, 2/3), euler(n, 0.7)
Calls with negative numerical arguments are automatially rewritten in terms of calls with positive arguments:
euler(n, 2)
euler(n, 12.345)
Float evaluation of high degree polynomials may be numerically unstable:
exact := euler(50, 1 + I): float(exact);
euler(50, float(1 + I))
DIGITS := 40: euler(50, float(1 + I))
delete exact, DIGITS:
Some system functions such as diff
or expand
handle symbolic calls of euler
:
diff(euler(n, f(x)), x)
expand(euler(n, x + 2))
expand(euler(n, x))
expand(euler(n, 3*x))

An arithmetical expression representing a nonnegative integer 

Arithmetical expression.
M. Abramowitz and I. Stegun, "Handbook of Mathematical Functions", Dover Publications Inc., New York (1965).