linespace函数
numpy.linspace
numpy.linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=None)
Return evenly spaced numbers over a specified interval.
Returns num evenly spaced samples, calculated over the interval [start, stop].
The endpoint of the interval can optionally be excluded.
Parameters:start : scalar
The starting value of the sequence.
stop : scalar
The end value of the sequence, unless endpoint is set to False. In that case, the sequence consists of all but the
last of num + 1 evenly spaced samples, so that stop is excluded. Note that the step size changes when endpoint is
False.
num : int, optionallinspace numpy
Number of samples to generate. Default is 50. Must be non-negative.
endpoint : bool, optional
If True, stop is the last sample. Otherwise, it is not included. Default is True.
retstep : bool, optional
If True, return (samples, step), where step is the spacing between samples.
dtype : dtype, optional
The type of the output array. If  is not given, infer the data type from the other input arguments.
New in version 1.9.0.
Returns:samples : ndarray
There are num equally spaced samples in the closed interval[start, stop] or the half-open
interval [start, stop)(depending on whether endpoint is True or False).
step : float, optional
Only returned if retstep is True
Size of spacing between samples.

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