1.1 Introduction

MATH1 (Mathematical Processing Sub-Package) is a collection of the most basic subroutines in the DCL (Dennou Chikyuu Library).

MATH1 consists of several sub-packages.

SYSLIB: Internal Variable Management and Message Output
OSLIB: System-dependent Routines
FNCLIB: Basic Functions (Maximum Integer, Remainder, etc.)
SUBLIB: Basic Subroutines (Creating Natural Alignments, etc.)
CHRLIB: Left and Right Alignment, Inversion, and Blank Handling of Character Strings
XFCLIB: Digitization of Character Strings
LRLLIB: Comparison of Floating-Point Values
BLKLIB: Floating-Number Values and Sequential Strings
GNMLIB: Convenient Truncation Values
INTLIB: Integers Near Floating-Point Values
INDXLIB: Searching Array Elements
IFALIB: Maximum/Minimum of Integers with Missing-Value Handling
RFALIB: Maximum/Minimum of Real Numbers with Missing-Value Handling
RFBLIB: Coefficient of Correlation for Covariance Inner Product of Floating-Point-Type Sequence.
VIALIB: Operator for a Single Integer-Type Array
VIBLIB: Operator for Two Integer-Type Arrays
VRALIB: Operator for a Single Floating-Point-Type Array
VRBLIB: Operator for Two Floating-Point-Type Arrays
CTRLIB: Coordinate Conversion and Rotation
MAPLIB: Conversion of Map Projection

Most of these sub-packages can perform "missing-value handling" and "comparison of the values of real values taking into consideration the errors of the values." Of these sub-packages, only OSLIB has machine-dependency on the source level. (SYSLIB manages system-dependent constants.)

In the following chapters, brief explanations will be provided on the features of MATH1 (internal variable management, missing-value handling, and comparison including error), and also on the FORTRAN'' architecture upon which these packages are based.