Matrix_flt

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Overview

Matrix_flt is a two-dimensional array of single precision floating point data, i.e. each element in the matrix takes 4 bytes of computer memory. 

A matrix_flt can have a null data, so that a particular element whose value equal to the specified value of nulldata will be omitted in matrix computation, for example calculation of minimum, maximum, or in matrix operation, for e.g. matrix overlay. 

A matrix_flt also has a flag_null, and its value can be 0 (off) or 1 (on).  When flag_null = 0, there is no omission of nulldata.

Member data

Name Data type Meaning
nrow int number of rows
ncol int number of columns
flag_null bool a flag indicates whether the null data is omitted in computation(0 = no, 1 = yes)
nulldata bool value of null data (not application if flag_null = 0)

 

Operator

See details in operator section.

 

Construction function

{Matrix_flt} ret  =  MATRIX_FLT([{int} argm1, {int} argm2, {float} argm3])

argm1 = no of row        (default = 0)

argm2 = no of column     (default = 0)

argm3 = initial value    (default = 0)

Example:

->A = Matrix_flt()

->print A

     no of row     : 0

     no of column  : 0

->B = Matrix_flt(3,2, 10.15)

->B

ans =

    no of row     : 3

    no of column  : 2

   0:              10.150              10.150

   1:              10.150              10.150

   2:              10.150              10.150

 

Lfunction

object({int} argm1, {int} argm2)   =  {float} left-value

argm1 = row index

argm2 = column index     

object.FLAG_NULL()   =  {bool} left-value

object.NULLDATA()    =  {double} left-value

Example:

->B(0,0) = 999

->B

ans =

    no of row     : 3

    no of column  : 2

   0:             999.000              10.150

   1:              10.150              10.150

   2:              10.150              10.15

->B.flag_null()

ans = 0

->B.flag_null() = 1

->B.flag_null()

 ans = 1

->B.nulldata()

ans = 0.000

->B.nulldata() = -90

->B.nulldata()

ans = -90.000

 

 

Class function

 

See class function of Matrix

 


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