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Number of quantization operations by quantizer object



a = noperations(q) returns the number of quantization operations during a call to quantize(q,...) for quantizer object q. This value accumulates over successive calls to quantize. You reset the value of noperations to zero by issuing the command reset(q) or resetlog(q).


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Create a default quantizer object, use it to quantize a vector of values, then return the number of quantization operations performed by the quantizer object.

q = quantizer;
y = quantize(q,-20:10);
Warning: 29 overflow(s) occurred in the fi quantize operation. 
> In embedded.quantizer/quantize (line 81) 

ans =


Input Arguments

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Input quantizer object.

Example: q = quantizer


Each time any data element is quantized, noperations is incremented by one. The real and complex parts are counted separately. For example, (complex*complex) counts four quantization operations for products and two for sum, because(a+bi)*(c+di) = (a*c - b*d) + (a*d + b*c). In contrast, (real*real) counts one quantization operation.

In addition, the real and complex parts of the inputs are quantized individually. As a result, for a complex input of length 204 elements, noperations counts 408 quantizations: 204 for the real part of the input and 204 for the complex part.

If any inputs, states, or coefficients are complex-valued, they are all expanded from real values to complex values, with a corresponding increase in the number of quantization operations recorded by noperations. In concrete terms, (real*real) requires fewer quantizations than (real*complex) and (complex*complex). Changing all the values to complex because one is complex, such as the coefficient, makes the (real*real) into (real*complex), raising noperations count.

Version History

Introduced before R2006a