round random a number

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Vadim Tambovtsev
Vadim Tambovtsev 2016-10-26
编辑： Bruno Luong 2018-9-14
Hello,
Suppose we have a number "3.76" and we want to round it either to 3 or 4 in a random way, how to do it? I didn't find the proper command in Matlab.

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James Tursa
James Tursa 2016-10-26
编辑：James Tursa 2016-10-26
For purely random rounding regardless of the fractional part:
x = your number
result = round(floor(x)+rand);
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Bruno Luong
Bruno Luong 2018-9-13
编辑：Bruno Luong 2018-9-14
James's solution gives equi-probability between 3 and 4. If one want to simulate some sort of quantification noise, might be it is desired to have larger probability of 4 than 3 for 3.76 as input, something like
round(x+rand-0.5)
or (almost) equivalently
floor(x + rand)

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Layan Alshuhumi
Layan Alshuhumi 2018-9-13
Make two variables, “Nmax” and “Nmin” and set Nmax to 5 and Nmin to 3 using the first two lines. On the third line, write the code to generate a random floating point number between 3 and 5 referencing your predefined variable

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