mxnet.np.linspace¶
-
linspace
(start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis=0, device=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 (int or float) – The starting value of the sequence.
stop (int or float) – 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, optional) – 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 dtype is not given, infer the data type from the other input arguments.
axis (int, optional) – The axis in the result to store the samples. Relevant only if start or stop are array-like. By default (0), the samples will be along a new axis inserted at the beginning. Use -1 to get an axis at the end.
device (Device, optional) – Device context on which the memory is allocated. Default is mxnet.device.current_device().
- 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.
See also
arange()
Similar to linspace, but uses a step size (instead of the number of samples).
Examples
>>> np.linspace(2.0, 3.0, num=5) array([2. , 2.25, 2.5 , 2.75, 3. ]) >>> np.linspace(2.0, 3.0, num=5, endpoint=False) array([2. , 2.2, 2.4, 2.6, 2.8]) >>> np.linspace(2.0, 3.0, num=5, retstep=True) (array([2. , 2.25, 2.5 , 2.75, 3. ]), 0.25)
Graphical illustration:
>>> import matplotlib.pyplot as plt >>> N = 8 >>> y = np.zeros(N) >>> x1 = np.linspace(0, 10, N, endpoint=True) >>> x2 = np.linspace(0, 10, N, endpoint=False) >>> plt.plot(x1.asnumpy(), y.asnumpy(), 'o') [<matplotlib.lines.Line2D object at 0x...>] >>> plt.plot(x2.asnumpy(), (y + 0.5).asnumpy(), 'o') [<matplotlib.lines.Line2D object at 0x...>] >>> plt.ylim([-0.5, 1]) (-0.5, 1) >>> plt.show()
Note
This function differs from the original numpy.linspace in the following aspects:
start and stop do not support list, numpy ndarray and mxnet ndarray
axis could only be 0
There could be an additional device argument to specify the device, e.g. the i-th GPU.