2.6 Predefined Constants

Following is a list of predefined UDI_object" constant scalars, provided as a convenience to the user. They may be used as arguments to functions requiring a scalar input. Here's an example code excerpt which creates a vector, fills it with values representing a triangular DSP window, and then divides each element by $2\pi$:

        UDI_object a, b;

        create_vector(a, 512, ELEM_REAL, VAL_FLOAT);
        trian(a);

        create_vector(b, 512, ELEM_REAL, VAL_FLOAT);

        vsdiv(a, Krf_2PI, b)

Note that if you didn't use the predefined constant, it would be necessary to create a SPMquotUDI_object" scalar explicitly with SPMquotcreate_scalar", and then use put_scalar" to assign it a value. Constants are defined for types: REAL_SHORT", REAL_LONG", SPMquotREAL_FLOAT", and SPMquotREAL_DOUBLE". Note that for the floating point constants, the high precision of the value in the table is specified for SPMquotREAL_DOUBLE", so all the digits are not usually significant for SPMquotREAL_FLOAT", depending on the machine architecture.

REAL_SHORT" constants	REAL_LONG" constants	value
Krs_0	Krl_0	0
Krs_1	Krl_1	1
Krs_m_1	Krl_m_1	-1
Krs_2	Krl_2	2
Krs_m_2	Krl_m_	-2
Krs_4	Krl_4	4
Krs_m_4	Krl_m_	-4
Krs_8	Krl_8	8
Krs_m_8	Krl_m_	-8
Krs_16	Krl_16	16
Krs_m_16	Krl_m_	-16
Krs_32	Krl_32	32
Krs_m_32	Krl_m_	-32
Krs_64	Krl_64	64
Krs_m_64	Krl_m_	-64
Krs_128	Krl_128	128
Krs_m_128	Krl_m_	-128
Krs_256	Krl_256	256
Krs_m_256	Krl_m_	-256
Krs_512	Krl_512	512
Krs_m_512	Krl_m_	-512
Krs_1024	Krl_1024	1024
Krs_m_1024	Krl_m_	-1024
Krs_2048	Krl_2048	2048
Krs_m_2048	Krl_m_	-2048
Krs_4096	Krl_4096	4096
Krs_m_4096	Krl_m_	-4096
Krs_8192	Krl_8192	8192
Krs_m_8192	Krl_m_	-8192
Krs_16384	Krl_16384	16384
Krs_m_16384	Krl_m_	-16384
Krs_MAX	Krl_MAX	largest short or long
Krs_MIN	Krl_MIN	smallest short or long

SPMquotREAL_FLOAT" constants	SPMquotREAL_DOUBLE" constants	value
Krf_0	Krd_0	0.0
Krf_1	Krd_1	1.0
Krf_m_1	Krd_m_1	-1.0
Krf_2	Krd_2	2.0
Krf_m_2	Krd_m_2	-2.0
Krf_o_2	Krd_o_2	0.5
Krf_om_2	Krd_om_2	-0.5
Krf_4	Krd_4	4.0
Krf_m_4	Krd_m_4	-4.0
Krf_o_4	Krd_o_4	0.25
Krf_om_4	Krd_om_4	-0.25
Krf_PI	Krd_PI	3.14159265358979323846
Krf_m_PI	Krd_m_PI	-3.14159265358979323846
Krf_o_PI	Krd_o_PI	0.31830988618379067154
Krf_om_PI	Krd_om_PI	-0.31830988618379067154
Krf_2PI	Krd_2PI	6.28318530717959
Krf_m_2PI	Krd_m_2PI	-6.28318530717959
Krf_o_2PI	Krd_o_2PI	0.15915494309190
Krf_om_2PI	Krd_om_2PI	-0.15915494309190
Krf_4PI	Krd_4PI	12.56637061435917
Krf_m_4PI	Krd_m_4PI	-12.56637061435917
Krf_o_4PI	Krd_o_4PI	0.07957747154595
Krf_om_4PI	Krd_om_4PI	-0.07957747154595
Krf_sq_PI	Krd_sq_PI	9.86960440108936
Krf_m_sq_PI	Krd_m_sq_PI	-9.86960440108936
Krf_o_sq_PI	Krd_o_sq_PI	0.10132118364234
Krf_om_sq_PI	Krd_om_sq_PI	-0.10132118364234
Krf_sq_2PI	Krd_sq_2PI	39.47841760435743
Krf_m_sq_2PI	Krd_m_sq_2PI	-39.47841760435743
Krf_o_sq_2PI	Krd_o_sq_2PI	0.02533029591058
Krf_om_sq_2PI	Krd_om_sq_2PI	-0.02533029591058
Krf_sqrt_2	Krd_sqrt_2	1.41421356237310
Krf_sqrt_3	Krd_sqrt_3	1.73205080756888
Krf_sqrt_5	Krd_sqrt_5	2.23606797749979
Krf_sqrt_PI	Krd_sqrt_PI	1.77245385090552
Krf_ln_2	Krd_ln_2	0.69314718055995
Krf_ln_10	Krd_ln_10	2.30258509299405
Krf_log_2	Krd_log_2	0.30102999566398
Krf_log_E	Krd_log_E	0.43429448190325
Krf_log2_E	Krd_log2_E	1.44269504088896
Krf_log2_10	Krd_log2_10	3.32192809488736
Krf_E	Krd_E	2.71828182845905
Krf_m_E	Krd_m_E	-2.71828182845905
Krf_o_E	Krd_o_E	0.36787944117144
Krf_om_E	Krd_om_E	-0.36787944117144
Krf_MAX;	Krd_MAX	1.701e+38