[英]Can't Multiply Sequence By Non-Int of Type Float? Python
Module OneDMaps: 模块OneDMaps:
def LogisticMap(a,nIts,x):
for n in xrange(0,nIts):
return 4.*a*x*(1.-x)
Actual Program: 实际计划:
# Import plotting routines
from pylab import *
import OneDMaps
def OneDMap(a,N,x,f):
return x.append(f(a,N,x))
# Simulation parameters
# Control parameter of the map: A period-3 cycle
a = 0.98
# Set up an array of iterates and set the initital condition
x = [0.1]
# The number of iterations to generate
N = 100
#function name in OneDMaps module
func = LogisticMap
# Setup the plot
xlabel('Time step n') # set x-axis label
ylabel('x(n)') # set y-axis label
title(str(func) + ' at r= ' + str(a)) # set plot title
# Plot the time series: once with circles, once with lines
plot(OneDMap(a,N,x,func), 'ro', OneDMap(a,N,x,func) , 'b')
The program is supposed to call a function from a module OneDMaps.py and then plot it against it's iterates. 该程序应该从模块OneDMaps.py调用一个函数,然后根据它的迭代绘制它。 I get the error "Can't multiply sequence by non-int of type float" and i've tried using LogisticMap(float(a)...) but that didn't work.
我得到错误“不能将类型浮点数的非int乘以序列”并且我尝试使用LogisticMap(float(a)...)但是这不起作用。 Also I want the function name to show up in the title of the plot but i get "at r=0.98 instead of it saying LogisticMap at r= 0.98.
此外,我希望函数名称显示在图表的标题中,但我得到“在r = 0.98,而不是在r = 0.98时说LogisticMap”。
You set up a list
like this: 你设置了这样一个
list
:
x = [0.1]
You then multipy it by a float
: 然后你用
float
乘以它:
return 4.*a*x*(1.-x)
You can't do that. 你不能这样做。 Perhaps you wanted
x
to be an array
instead of a list
? 也许你想让
x
成为一个array
而不是一个list
?
x = array([0.1])
(That would do the multiplication elementwise) (那会元素乘法)
Note that adding lists concatenates: 请注意,添加列表连接:
[0] + [1] == [0, 1]
Multiplication by an integer is the same as concatenating that many times: 乘以整数与连续多次相同:
[0] * 3 == [0, 0, 0]
But that makes no sense for floats, 但这对花车毫无意义,
[0] * 3.0 #raises TypeError as you've seen
(what should you get if you multiply by 3.5 for example?) (例如,如果乘以3.5,你应该得到什么?)
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