我正在编写一个C程序,它将数据输出到文件,生成
python脚本并调用pyplot来进行绘图.
但是,当我按指针传递参数时,它可以正确编译,但无法运行.它返回错误.当我使用Xcode调试模式并逐步执行它时,它会偶然提供正确的结果,但并非总是如此.有时它也会返回错误.
我怀疑它可能是由一些内存分配问题引起的,但我无法确定究竟是什么问题.
我的代码如下:
1)主要
#include <iostream> #include <stdlib.h> #include <cmath> #include "PyCPlot.h" using namespace std; double pi = 3.1415926; int main(int argc,const char * argv[]) { int nline = 100; double * np_list = new double(nline); double * pack_fraction_np = new double (nline); for (int i=0; i<nline; i++){ np_list[i] = double(i)/double(nline)*2*pi; pack_fraction_np[i] = cos(np_list[i]); } PyCPlot_data_fout("RandomPacking",nline,np_list,pack_fraction_np); PyCPlot_PythonScript("RandomPacking","Random Packing"); PyCPlot_pyplot("RandomPacking","Random Packing"); return 0; }
2)头文件
#ifndef PyCPlot_h #define PyCPlot_h #include <iostream> #include <cmath> #include <fstream> #include <string> #include <stdlib.h> using namespace std; int PyCPlot_data_fout(string datafilename,int nline,double * x,double *y){ ofstream fout; fout.open(datafilename+".txt"); fout << nline << endl; for (int i=0; i<nline; i++){ fout << x[i] << " " << y[i] << endl; } fout.close(); return 0; } int PyCPlot_PythonScript(string datafilename,string plttitle){ string strhead = "import numpy as np\nimport matplotlib.pyplot as plt\n"; string strpltfig = "plt.figure()\n"; string strpltplt = "plt.plot(xlist,ylist)\n"; string strplttit = "plt.title('"+plttitle+"')\n"; string strpltshw = "plt.show()\n"; string strfileopen ="f = open('"+datafilename+".txt','r')\n"; string strreadline ="size = map(int,f.readline().split())\n"; string strpltlist ="xlist = np.zeros((size))\nylist = np.zeros((size))\n"; string strfor = "for i in range(size[0]):\n xlist[i],ylist[i] = map(float,f.readline().split())\n"; ofstream pyout; pyout.open("PyCPlot_"+datafilename+".py"); pyout << strhead << strfileopen << strreadline << strpltlist << strfor; pyout << strpltfig << strpltplt << strplttit << strpltshw; pyout.close(); return 0; } int PyCPlot_pyplot(string datafilename,string plttitle){ string strsystemsh ="source ~/.bashrc; python PyCPlot_"+datafilename+".py"; system(strsystemsh.c_str()); return 0; } #endif /* PyCPlot_h */
当它运行时,我得到以下错误消息
malloc: *** error for object 0x1002002e8: incorrect checksum for freed object - object was probably modified after being freed.
解决方法
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