[英]Python can't multiply sequence by non-int of type 'float'
I am trying to evaluate a formula, np
is numpy
: 我正在尝试评估一个公式, np
是numpy
:
Ds = pow(10,5)
D = np.linspace(0, pow(10,6), 100)
alpha=1.44
beta=0.44
A=alpha*(D/Ds)
L=1.65
buf2=L/4.343
buf=pow(-(alpha*[D/Ds]),beta)
value=exp(buf)
and then I will plot this data but I get: 然后我将绘制这些数据但我得到:
buf=pow(-(alpha*[D/Ds]),beta)
TypeError: can't multiply sequence by non-int of type 'float'
How can I overcome this? 我怎么能克服这个?
Change: 更改:
buf=pow(-(alpha*[D/Ds]),beta)
to: 至:
buf=pow(-(alpha*(D/Ds)),beta)
This: 这个:
[D/Ds]
gives you list with one element. 为您提供一个元素的列表。
But this: 但是这个:
alpha * (D/Ds)
computes the divisions before the multiplication with alpha
. 在乘以alpha
之前计算除法。
You can multiply a list by an integer: 您可以将列表乘以整数:
>>> [1] * 4
[1, 1, 1, 1]
but not by a float: 但不是浮动:
[1] * 4.0
TypeError: can't multiply sequence by non-int of type 'float'
since you cannot have partial elements in a list. 因为您不能在列表中包含部分元素。
Parenthesis can be used for grouping in the mathematical calculations: 括号可用于数学计算中的分组:
>>> (1 + 2) * 4
12
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