instget

Data from instrument variable

Syntax

Data = instget(InstSet,Name,Value)

Description

Data = instget(InstSet,Name,Value) retrieves Data from an instrument variable.

Examples

Retrieve Data Arrays From Instrument Variable

Retrieve the instrument set ExampleInst from the data file InstSetExamples.mat. ExampleInst contains three types of instruments: Option, Futures, and TBill.

load InstSetExamples; 
instdisp(ExampleInst)

Index Type   Strike Price Opt  Contracts
1     Option  95    12.2  Call     0    
2     Option 100     9.2  Call     0    
3     Option 105     6.8  Call  1000    
 
Index Type    Delivery       F     Contracts
4     Futures 01-Jul-1999    104.4 -1000    
 
Index Type   Strike Price Opt  Contracts
5     Option 105     7.4  Put  -1000    
6     Option  95     2.9  Put      0    
 
Index Type  Price Maturity       Contracts
7     TBill 99    01-Jul-1999    6        
 

Extract the price from all instruments.

P = instget(ExampleInst,'FieldName','Price')

P = 7×1

   12.2000
    9.2000
    6.8000
       NaN
    7.4000
    2.9000
   99.0000

Get all the prices and the number of contracts held.

[P,C] = instget(ExampleInst, 'FieldName', {'Price', 'Contracts'})

P = 7×1

   12.2000
    9.2000
    6.8000
       NaN
    7.4000
    2.9000
   99.0000

C = 7×1

           0
           0
        1000
       -1000
       -1000
           0
           6

Compute a value V. Create a new variable ISet that appends V to ExampleInst.

V = P.*C 

V = 7×1

           0
           0
        6800
         NaN
       -7400
           0
         594

ISet = instsetfield(ExampleInst, 'FieldName', 'Value', 'Data',V); 
instdisp(ISet) 

Index Type   Strike Price Opt  Contracts Value
1     Option  95    12.2  Call     0         0
2     Option 100     9.2  Call     0         0
3     Option 105     6.8  Call  1000      6800
 
Index Type    Delivery       F     Contracts Value
4     Futures 01-Jul-1999    104.4 -1000     NaN  
 
Index Type   Strike Price Opt  Contracts Value
5     Option 105     7.4  Put  -1000     -7400
6     Option  95     2.9  Put      0         0
 
Index Type  Price Maturity       Contracts Value
7     TBill 99    01-Jul-1999    6         594  
 

Look at only the instruments that have nonzero Contracts.

Ind = find(C ~= 0)

Ind = 4×1

     3
     4
     5
     7

Get the Type and Opt parameters from those instruments. (Only options have a stored 'Opt' field.)

[T,O] = instget(ExampleInst, 'Index', Ind, 'FieldName',{'Type', 'Opt'})

T = 4x7 char array
    'Option '
    'Futures'
    'Option '
    'TBill  '

O = 4x4 char array
    'Call'
    '    '
    'Put '
    '    '

Create a report of holdings Type, Opt, and Value.

rstring = [T, O, num2str(V(Ind))] 

rstring = 4x16 char array
    'Option Call 6800'
    'Futures      NaN'
    'Option Put -7400'
    'TBill        594'

Input Arguments

InstSet — Instrument variable

structure

Instrument variable containing a collection of instruments, specified as InstSet structure. Instruments are classified by type; each type can have different data fields. The stored data field is a row vector or character vector for each instrument.

Data Types: struct

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: Data = instget(ExampleInst,'FieldName','Price')

'FieldName' — Name of each data field for instrument

all fields available for returned set of instruments (default) | cell array of character vectors

Name of each data field for an instrument, specified as the comma-separated pair consisting of 'FieldName' and an NFIELDS-by-1 cell array of character vectors. FieldName entries can also be either Type or Index; these return type strings and index numbers respectively.

Data Types: char | cell

'Index' — Number of instruments

all indices available in instrument variable (default) | vector

Number of instruments, specified as the comma-separated pair consisting of 'Index' and an NINST-by-1 vector of positions of instruments to work on. If Type is also entered, instruments referenced must be one of the types and contained in Index.

Data Types: double

'Type' — Number of types

all types in the instrument variable (default) | character vector

Number of types, specified as the comma-separated pair consisting of 'Type' and a NTYPES-by-1 cell array of character vectors restricting instruments worked on to match one of Type types.

Data Types: char | cell

Output Arguments

Data — Data contents

array

Data content, returned as an NINST-by-M array of data contents for the first field in FieldName. Each row corresponds to a separate instrument in the specified Index. Unavailable data is returned as NaN or as spaces.