'/' used for creating an axis, DFT

2017 10 27
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更新时间：2017 10 27
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How does building an axis in that way: 'freq= [-pi+pi/L:2*pi/L:pi-pi/L];' work exactly? Why so many '/' signs and what do they exactly do? DFT

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Star Strider
Star Strider 2017-10-27

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This assignment:
freq = [-pi+pi/L:2*pi/L:pi-pi/L];
is apparently for a two-sided Fourier transform, where ‘L’ is the length of the Fourier transform vector. The increment of the vector is ‘pi/L’, where the ‘/’ is right division (specifically, ‘matrix right division’, see the mrdivide (link) documentation for details). The vector goes from ( -pi + the increment ) to ( pi - the increment ). Supply an integer value for ‘L’ and run that line to see how it works.

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Steven Lord
Steven Lord 2017-10-27

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The / operator performs division.
>> x = 1/3
x =
0.333333333333333
The colon operator : creates a vector.
>> from1To7InStepsOf2 = 1:2:7
from1To7InStepsOf2 =
1 3 5 7

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