pyld2zero
Zero curve given par yield curve
In R2017b, the specification of optional input arguments has changed. While the
previous ordered inputs syntax is still supported, it may no longer be supported in
a future release. Use the new optional name-value pair inputs:
InputCompounding
, InputBasis
,
OutputCompounding
, and
OutputBasis
.
Syntax
Description
[
returns a zero curve given a par yield curve and its maturity dates. If either
input for ZeroRates
,CurveDates
] = pyld2zero(ParRates
,CurveDates
,Settle
)CurveDates
or Settle
is a
datetime array, CurveDates
is returned as a datetime array.
Otherwise, CurveDates
is returned as a serial date number.
[
adds optional name-value pair argumentsZeroRates
,CurveDates
] = pyld2zero(___,Name,Value
)
Examples
Compute Zero Curve Given Par Yield Curve
Define the settlement date, maturity, and zero rates.
Settle = datenum('01-Feb-2013');
CurveDates = datemnth(Settle,12*[1 2 3 5 7 10 20 30]');
ZeroRates = [.11 0.30 0.64 1.44 2.07 2.61 3.29 3.55]'/100;
InputCompounding = 2;
InputBasis = 1;
OutputCompounding = 2;
OutputBasis = 1;
Compute par yield curve from zero rates.
ParRates = zero2pyld(ZeroRates, CurveDates, Settle,'InputCompounding',2,... 'InputBasis',1,'OutputCompounding',2,'OutputBasis',1)
ParRates = 8×1
0.0011
0.0030
0.0064
0.0142
0.0201
0.0251
0.0309
0.0330
Compute zero curve from the par yield curve.
ZeroRates = pyld2zero(ParRates, CurveDates, Settle,'InputCompounding',2,... 'InputBasis',1,'OutputCompounding',2,'OutputBasis',1)
ZeroRates = 8×1
0.0011
0.0030
0.0064
0.0144
0.0207
0.0261
0.0329
0.0355
Compute Zero Curve Given Par Yield Curve Using datetime Inputs
Use datetime
inputs to compute the zero curve given the par yield curve.
Settle = datetime(2013,2,1); CurveDates = [datetime(2014,2,1) datetime(2015,2,1) datetime(2016,2,1) datetime(2018,2,1) datetime(2020,2,1) datetime(2023,2,1) datetime(2033,2,1) datetime(2043,2,1)]; OriginalParRates = [0.11 0.30 0.64 1.42 2.02 2.51 3.10 3.31]'/100; InputCompounding = 1; InputBasis = 0; OutputCompounding = 1; OutputBasis = 0; [ZeroRates Dates] = pyld2zero(OriginalParRates, CurveDates, Settle, ... 'OutputCompounding', OutputCompounding, 'OutputBasis', OutputBasis, ... 'InputCompounding', InputCompounding, 'InputBasis', InputBasis)
ZeroRates = 8×1
0.0011
0.0030
0.0064
0.0144
0.0207
0.0261
0.0329
0.0356
Dates = 8x1 datetime
01-Feb-2014
01-Feb-2015
01-Feb-2016
01-Feb-2018
01-Feb-2020
01-Feb-2023
01-Feb-2033
01-Feb-2043
Demonstrate a Roundtrip From pyld2zero
to zero2pyld
Given the following a par yield curve and its maturity dates, return the ZeroRates
.
Settle = datetime(2013,2,1); CurveDates = [datetime(2014,2,1) datetime(2015,2,1) datetime(2016,2,1) datetime(2018,2,1) datetime(2020,2,1) datetime(2023,2,1) datetime(2033,2,1) datetime(2043,2,1)]; OriginalParRates = [0.11 0.30 0.64 1.42 2.02 2.51 3.10 3.31]'/100; InputCompounding = 1; InputBasis = 0; OutputCompounding = 1; OutputBasis = 0; ZeroRates = pyld2zero(OriginalParRates, CurveDates, Settle, ... 'OutputCompounding', OutputCompounding, 'OutputBasis', OutputBasis, ... 'InputCompounding', InputCompounding, 'InputBasis', InputBasis)
ZeroRates = 8×1
0.0011
0.0030
0.0064
0.0144
0.0207
0.0261
0.0329
0.0356
With the ZeroRates
, use the zero2pyld
function to return the ParRatesOut
and determine the roundtrip error.
ParRatesOut = zero2pyld(ZeroRates, CurveDates, Settle, ... 'OutputCompounding', OutputCompounding, 'OutputBasis', OutputBasis, ... 'InputCompounding', InputCompounding, 'InputBasis', InputBasis)
ParRatesOut = 8×1
0.0011
0.0030
0.0064
0.0142
0.0202
0.0251
0.0310
0.0331
max(abs(OriginalParRates - ParRatesOut)) % Roundtrip error
ans = 1.2750e-16
Input Arguments
ParRates
— Annualized par yields
decimal fraction
Annualized par yields (coupon rates), specified as a
NUMBONDS
-by-1
vector using
decimal fractions. In aggregate, the rates constitute an implied zero
curve for the investment horizon represented by
CurveDates
.
Data Types: double
CurveDates
— Maturity dates
datetime array | string array | date character vector
Maturity dates which correspond to the input
ParRates
, specified as a
NUMBONDS
-by-1
vector using a
datetime array, string array, or date character vectors.
To support existing code, pyld2zero
also
accepts serial date numbers as inputs, but they are not recommended.
Data Types: datetime
| string
| char
Settle
— Common settlement date for ZeroRates
datetime scalar | string scalar | date character vector
Common settlement date for input ParRates
,
specified as a scalar datetime, string, or data character vector.
To support existing code, pyld2zero
also
accepts serial date numbers as inputs, but they are not recommended.
Data Types: datetime
| string
| char
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: [ZeroRates,CurveDates] =
pyld2zero(ParRates,CurveDates,Settle,'OutputCompounding',3,'OutputBasis',5,'InputCompounding',4,'InputBasis',5)
OutputCompounding
— Compounding frequency of output ZeroRates
2
(default) | numeric values: 0
,1
,
2
, 3
,
4
, 6
, 12
,
365
, -1
Compounding frequency of output ZeroRates
,
specified using the allowed values:
0
— Simple interest (no compounding)1
— Annual compounding2
— Semiannual compounding (default)3
— Compounding three times per year4
— Quarterly compounding6
— Bimonthly compounding12
— Monthly compounding365
— Daily compounding-1
— Continuous compounding
Note
If
OutputCompounding
is set to0
(simple),-1
(continuous), or365
(daily), theInputCompounding
must also be specified using a valid value.If
OutputCompounding
is not specified, thenOutputCompounding
is assigned the value specified forInputCompounding
.If either
OutputCompounding
orInputCompounding
are not specified, the default is2
(semiannual) for both.
Data Types: double
OutputBasis
— Day-count basis of output ZeroRates
0
(default) | numeric values: 0
,1
,
2
, 3
,
4
, 6
, 7
,
8
, 9
,
10
, 11
,
12
, 13
Day count basis of output ZeroRates
,
specified using allowed values:
0 = actual/actual
1 = 30/360 (SIA)
2 = actual/360
3 = actual/365
4 = 30/360 (PSA)
5 = 30/360 (ISDA)
6 = 30/360 (European)
7 = actual/365 (Japanese)
8 = actual/actual (ICMA)
9 = actual/360 (ICMA)
10 = actual/365 (ICMA)
11 = 30/360E (ICMA)
12 = actual/365 (ISDA)
13 = BUS/252
For more information, see Basis.
Note
If OutputBasis
is not specified, then
OutputBasis
is assigned the value
specified for InputBasis
. If either
InputBasis
or
OutputBasis
are not specified, the
default is 0
(actual/actual) for both.
Data Types: double
InputCompounding
— Compounding frequency of input ParRates
2
(default) | numeric values: 0
,1
,
2
, 3
,
4
, 6
, 12
,
365
, -1
Compounding frequency of input ParRates
,
specified using allowed values:
1
— Annual compounding2
— Semiannual compounding (default)3
— Compounding three times per year4
— Quarterly compounding6
— Bimonthly compounding12
— Monthly compounding
Note
If
OutputCompounding
is1
,2
,3
,4
,6
, or12
andInputCompounding
is not specified, the value ofOutputCompounding
is used.If
OutputCompounding
is0
(simple),-1
(continuous), or365
(daily), a validInputCompounding
value must also be specified.If either
InputCompounding
orOutputCompounding
are not specified, the default is2
(semiannual) for both.
Data Types: double
InputBasis
— Day-count basis of input ParRates
0
(default) | numeric values: 0
,1
,
2
, 3
,
4
, 6
, 7
,
8
, 9
,
10
, 11
,
12
, 13
Day count basis of the input ParRates
,
specified using allowed values:
0 = actual/actual
1 = 30/360 (SIA)
2 = actual/360
3 = actual/365
4 = 30/360 (PSA)
5 = 30/360 (ISDA)
6 = 30/360 (European)
7 = actual/365 (Japanese)
8 = actual/actual (ICMA)
9 = actual/360 (ICMA)
10 = actual/365 (ICMA)
11 = 30/360E (ICMA)
12 = actual/365 (ISDA)
13 = BUS/252
For more information, see Basis.
Note
If InputBasis
is not specified, then
InputBasis
is assigned the value
specified for OutputBasis
. If either
InputBasis
or
Outputbasis
are not specified, the
default is 0
(actual/actual) for both.
Data Types: double
Output Arguments
ZeroRates
— Zero rates
numeric
Zero rates, returned as a
NUMBONDS
-by-1
numeric vector.
In aggregate, the rates in ZeroRates
constitute a
zero curve for the investment horizon represented by
CurveDates
. ZeroRates
are
ordered by ascending maturity.
CurveDates
— Maturity dates that correspond to ZeroRates
datetime | serial date number
Maturity dates that correspond to the ZeroRates
,
returned as a NUMBONDS
-by-1
vector
of maturity dates that correspond to each par rate contained in
ZeroRates
. CurveDates
are
ordered by ascending maturity.
If either input for CurveDates
or
Settle
is a datetime array,
CurveDates
is returned as a datetime array.
Otherwise, CurveDates
are returned as a serial date
numbers. Use the function datetime
to convert serial
date numbers to formatted datetime arrays.
Version History
Introduced before R2006aR2022b: Serial date numbers not recommended
Although pyld2zero
supports serial date numbers,
datetime
values are recommended instead. The
datetime
data type provides flexible date and time
formats, storage out to nanosecond precision, and properties to account for time
zones and daylight saving time.
To convert serial date numbers or text to datetime
values, use the datetime
function. For example:
t = datetime(738427.656845093,"ConvertFrom","datenum"); y = year(t)
y = 2021
There are no plans to remove support for serial date number inputs.
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