[英]Reading meshgrid data from file in python
I have a file "data.dat" following data: 我有以下数据文件“ data.dat”:
[[0.2 0.3 0.4][0.3 0.2 0.4][0.5 0.3 0.4]]
Now I am reading this data from file as 现在我从文件中读取此数据为
f=open("data.dat","r")
z=f.read()
f.close()
I have x=[1 2 3]
& y=[1 2 3]
. 我有
x=[1 2 3]
和y=[1 2 3]
。 I made a meshgrid from x
& y
as 我用
x
和y
制作了一个网格
X,Y=plt.meshgrid(x,y)
Now I am trying to do contour plot using 现在我正在尝试使用绘制轮廓图
plt.contourf(X,Y,Z)
But it is showing error as: ValueError: could not convert string to float: [[0.2 0.3 0.4][0.3 0.2 0.4][0.5 0.3 0.4]] 但是它显示错误为:ValueError:无法将字符串转换为float:[[0.2 0.3 0.4] [0.3 0.2 0.4] [0.5 0.3 0.4]]
Any suggestion about how to read Z
array as float from file or to write the "data.dat" file in other way? 关于如何从文件中读取
Z
数组为float或以其他方式写入“ data.dat”文件的任何建议?
You are reading a string from the file and putting that string to Z
. 您正在从文件中读取字符串,并将该字符串放入
Z
But in fact you need two-dimensional array of floats instead of string. 但实际上,您需要浮点数的二维数组而不是字符串。 So you have to parse your string.
因此,您必须解析您的字符串。 It can be done by converting it to JSON like this:
可以通过将其转换为JSON来完成,如下所示:
import json
with open("data.dat") as f:
z = f.read()
z = z.replace(' ', ', ').replace('][', '], [')
Z = json.loads(z)
the other (and better) way is to use JSON to store your data in a file. 另一种(更好的方法)是使用JSON将数据存储在文件中。
import json
Z = [[0.2, 0.3, 0.4], [0.3, 0.2, 0.4], [0.5, 0.3, 0.4]]
with open("data.dat", 'w') as f:
json.dump(Z, f)
You also can try different formats, like CSV. 您还可以尝试其他格式,例如CSV。
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