Question

我想用2列初始化一个空数组，以后可以在该数组中添加新行。

我有以下代码：

Sub ExportSlidesToIndividualPPPTX()
  Dim oPPT As Presentation, oSlide As Slide
  Dim sPath As String
  Dim oTempPres As Presentation
  Dim x As Long

  ' Location of PPTX File
  Set oPPT = Presentations.Open(FileName:="K:\PRESENTATION_YOU_ARE_EXPORTING.pptx")
  ' Location Where Individual Slides Should Be Saved
  ' Add \ in the end
  sPath = "K:\FOLDER PATH WHERE PPTX SHOULD BE EXPORTED\"

  For Each oSlide In oPPT.Slides
     lSlideNum = oSlide.SlideNumber
     sFileName = sPath & "Slide - " & lSlideNum & ".pptx"
     oPPT.SaveCopyAs sFileName
     ' open the saved copy windowlessly
     Set oTempPres = Presentations.Open(sFileName, , , False)

     ' Delete all slides before the slide you want to save
     For x = 1 To lSlideNum - 1
         oTempPres.Slides(1).Delete
     Next

     ' Delete all slides after the slide you want to save
     For x = oTempPres.Slides.Count To 2 Step -1
         oTempPres.Slides(x).Delete
     Next

     oTempPres.Save
     oTempPres.Close

  Next

  Set oPPT = Nothing

End Sub

但是当我运行代码时，出现此错误：

import numpy as np
import statistics as st
import pyswarms as ps
import matplotlib.pyplot as plt
from sklearn.neural_network import MLPClassifier


def load_input():
dados = np.array([])
for x in range(1,22):
        fich = np.loadtxt("%d.csv" %x,delimiter=",");
        aux = []
        valor = 5.0;
        for y in range(0,len(fich)):
            if fich[y][0] <= valor :
                aux.append(fich[y,1])
                aux.append(fich[y,2])
                aux.append(fich[y,3])
            else:
                dados = np.vstack((dados,np.array([st.mean(aux),x])));
                dados = np.vstack((dados,np.array([st.stdev(aux),x])));
                y = y-1;
                aux[:] = []
                valor = valor + 5;
   return dados

我认为在尝试将新行添加到数组后，错误就来了。我该如何解决？

Answer 1

您应该使用np.stack（）而不是np.vstack（），因为每个文档均不推荐使用vstack：[https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.vstack.html]

对dado使用普通的python数组并将其追加到其中，然后在构建数组后调用np.stack（）。

如何在python上初始化具有2列但行数未定义的数组？

1 个答案: