oph_quantize¶

Description¶

Behaviour

It quantizes an array according to a binary list of quantization level and a binary list of quantization values (expressed as doubles).

Let the quantization levels be l₁,l₂,...,l_k and the quantization values v₁,v₂,...,v_s. Let measures be m₁,m₂,...,m_q. The implemented function operates in this way:

for m in {m₁,...,m_q}

if m <= l₁ then m = v₁

if l₁ < m <= l₂ then m = v₂

...

if l_k-1 < m <= l_k then m = v_s-1

if m > l_k then m = v_s

So it has to be s=k+1.

Parameters

• input measure type: Ophidia typing. Supported types are: ‘oph_double’; ‘oph_float’; ‘oph_long’; ‘oph_int’; ‘oph_short’; ‘oph_byte’.
• output measure type: Ophidia typing. Supported types are: ‘oph_double’; ‘oph_float’; ‘oph_long’; ‘oph_int’; ‘oph_short’; ‘oph_byte’.
• measure: input measure.
• binary quantization levels: binary array of doubles representing quantization levels.
• binary quantization values: binary array of doubles representing quantization values.

Return type

Binary-array.

Examples

Assign 0 to all elements <= 5, 1 to all elements > 10 and 0.5 to all the others.

oph_quantize('OPH_DOUBLE','OPH_DOUBLE',measure,oph_to_bin('','OPH_DOUBLE','5,10'),oph_to_bin('','OPH_DOUBLE','0,0.5,1'))

Operation type

Simple.

Arguments¶