Linear equation/interpolation - basic compile errors
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Thread: Linear equation/interpolation - basic compile errors

  1. #1
    Join Date
    Oct 2012
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    6

    Linear equation/interpolation - basic compile errors

    I am trying to create C++ code that allows a linear equation (interpolator?) to take in a value and produce an output based on a table that is specified.

    The problem I am having is the GE compiler uses libraries not available in Visual studio and visa versa…
    Screen shot of error…” error: expected ‘=’ ‘,’’;’’asm’…ect.

    This is the code I am working with. Just set up a flat XY trying to link inputs and outputs to X0 – Xn and Y0 – Yn.
    // Lin_Interp.c : Defines the entry point for the console application.
    //
    #include "PACRXPlc.h" /* Include file applicable for all targets */
    #include "string.h"
    #include "math.h"
    #include "stdlib.h"
    #include <time.h>
    #include <ctype.h>
    #include <stdio.h>
    /* Constants / #defines */
    T_INT16 *X, T_INT16 *X0, T_INT16 *X1, T_INT16 *X2, T_INT16 *Y0, T_INT16 *Y1, T_INT16 *Y2, T_INT16 *Z1)
    int Gefmain =(){
    label1:
    int i=0,j=0,X0=0,Y0=0,X1=0,Y1=0;
    double X,Y,Fxy=0,Fxy0=0,FxyOld=0,Fxy1=0;
    // "Lin Interp Y OPERATING LIMIT FUNCTION - CORRECTED Y ARRAY" TY
    double TY[11]={0,10,20,30,40,50,60,70,80,90,100,};
    // "Lin Interp X OPERATING LIMIT FUNCTION – CORRECTED X ARRAY" TX
    double TX[11]={0,10,20,30,40,50,60,70,80,90,100};
    // "LIN Interp OPERATING LIMIT FUNCTION - XY LIMIT ARRAY" XYlim
    double XYlim[11][11]={0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0};
    // Print-Out on console "XY LIMIT ARRAY" XYlim
    for (j=0;j<12;j++){
    for (i=0;i<10;i++){
    cout<< XYlim[i][j] << " "; //Display the curve
    }
    cout << endl;
    }
    // Input X, ensure it is in the range.
    cout<<endl<< "Please enter X value:";
    cin>>X;
    while (X >100.0 || X<0.0){
    cout<<endl<< "Your X value is either greater than 100.0 or smaller than 0.0, Please re-enter again:";
    cin>>X;
    }
    // Input Y, ensure it is in the range.
    cout<<endl<< "Please enter Y value:";
    cin>>Y;
    while (Y >100.0 || Y<0.0){
    cout<<endl<< "Your Y value is either greater than 100 or smaller than 0, Please re-enter again:";
    cin>>Y;
    }
    cout<<endl<< " X="<<X<< ". Y="<<Y<<endl<<endl;

    //Select the correct X0&Y0, X1&Y1
    for (i=0;i<10;i++){
    if (X >= TX[i]) X0=i;
    else break;
    }
    X1=X0+1;

    for (j=0;j<12;j++){
    if (Y >= SPD[j]) Y0=j;
    else break;
    }
    Y1=Y0+1;

    cout<< " X0="<<X0<< ". X1="<<X1<<" i="<<i<<endl;
    cout<< " Y0="<<Y0<< ". Y1="<<Y1<<" j="<<j<<endl<<endl;

    cout<< " KGV_X0["<<X0<<"]="<<TX[X0]<< " KGV_X1["<<X1<<"]="<<TX[X1]<<endl;
    cout<< " SPD_Y0["<<Y0<<"]="<<TY[Y0]<<" SPD_Y1["<<Y1<<"]="<<TY[Y1]<<endl<<endl;

    cout<< " XYlim["<<X0<<"]["<<Y0<<"]="<<XYlim[X0][Y0]<<endl;
    cout<< " XYlim["<<X1<<"]["<<Y0<<"]="<<XYlim[X1][Y0]<<endl;
    cout<< " XYlim["<<X0<<"]["<<Y1<<"]="<<XYlim[X0][Y1]<<endl;
    cout<< " XYlim["<<X1<<"]["<<Y1<<"]="<<XYlim[X1][Y1]<<endl<<endl;
    //calculate F(X,Y), and print-out on console.
    //Using one equation to calculate F(X,Y). The problem with this one equation method is if X0 = X1, then most of the equation's products go to zero.
    //To see this problem, enter an known X value like 48. Then enter a Y value that is not known or on the curve. Example would be X=48 and Y=92.5
    //The 3-equation result will be the correct value of 9.1815, the single equation result will be the result of X=48 and Y=90 or 8.672
    FxyOld=XYlim[X0][Y0]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y0]-XYlim[X0][Y0]))+
    ((Y-TY[Y0])/(TY[Y1]-TY[Y0])*(X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y1]-XYlim[X0][Y1]-XYlim[X1][Y0]+XYlim[X0][Y0]));
    //Using 3 equations to calculate F(X,Y). Using this method prevents the problem that occurs when X0 = X1 and Y0 does not equal Y1.
    Fxy0=XYlim[X0][Y0]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y0]-XYlim[X0][Y0]));
    Fxy1=XYlim[X0][Y1]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y1]-XYlim[X0][Y1]));
    Fxy=Fxy0+((Y-TY[Y0])/(TY[Y1]-TY[Y0])*(Fxy1-Fxy0));

    cout<< " Fxy["<<X<<"]["<<Y<<"]= "<<Fxy<<" (3-equation result)"<<endl<<endl;//Three equation result to screen
    cout<< " FxyOld["<<X<<"]["<<Y<<"]= "<<FxyOld<<" (1-equation result)"<<endl<<endl; //Single equation result to screen
    goto label1; //Start program over
    return 0;
    {

  2. #2
    Join Date
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    Re: Linear equation/interpolation - basic compile errors

    Frankly, this isn't readable. Fix the post by adding code tags and indentation. See http://forums.codeguru.com/misc.php?do=bbcode
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    Refresh your memory on formatting tags here
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  3. #3
    GCDEF is offline Elite Member Power Poster
    Join Date
    Nov 2003
    Posts
    12,120

    Re: Linear equation/interpolation - basic compile errors

    No Visual C++ question

    No code tags

    Not even an indication of which line generates the error. You won't get any help like that.

  4. #4
    Join Date
    Apr 1999
    Posts
    27,433

    Re: Linear equation/interpolation - basic compile errors

    Quote Originally Posted by controlsguy View Post
    I am trying to create C++ code that allows a linear equation (interpolator?) to take in a value and produce an output based on a table that is specified.

    The problem I am having is the GE compiler uses libraries not available in Visual studio and visa versa…
    Screen shot of error…” error: expected ‘=’ ‘,’’;’’asm’…ect.
    1) Use code tags when posting code. Your code is practically unreadable.

    2)
    Code:
    double XYlim[11][11];
    //...
    for (j=0;j<12;j++)  { 
        for (i=0;i<10;i++)  {
    cout<< XYlim[i][j] << " "; //Display the curve
      }
    }
    What happens when j == 11? You are then accessing the array with an out-of-bounds index.

    3)
    Code:
       goto label1;  //Start program over
    Get rid of this, and use proper looping constructs (while, do-while, etc.)

    Regards,

    Paul McKenzie
    Last edited by Paul McKenzie; October 13th, 2012 at 04:36 PM.

  5. #5
    Join Date
    Oct 2012
    Posts
    6

    Re: Linear equation/interpolation - basic compile errors

    Truly sorry about that guys. See below. Thank you for your help.

    Code:
    // Lin_Interp.c : Defines the entry point for the console application.
    //
    #include "PACRXPlc.h"  /* Include file applicable for all targets */
    #include "string.h"
    #include "math.h"
    #include "stdlib.h"
    #include <time.h>
    #include <ctype.h>
    #include <stdio.h>
    /* Constants / #defines  */
    T_INT16 *X, T_INT16 *X0, T_INT16 *X1, T_INT16 *X2, T_INT16 *Y0, T_INT16 *Y1, T_INT16 *Y2, T_INT16 *Z1)
    int Gefmain =(){
           label1:
        int i=0,j=0,X0=0,Y0=0,X1=0,Y1=0;
          double X,Y,Fxy=0,Fxy0=0,FxyOld=0,Fxy1=0;
    // "Lin Interp Y OPERATING LIMIT FUNCTION - CORRECTED Y ARRAY"  TY
          double TY[11]={0,10,20,30,40,50,60,70,80,90,100,};
    // "Lin Interp X OPERATING LIMIT FUNCTION – CORRECTED X ARRAY"  TX
          double TX[11]={0,10,20,30,40,50,60,70,80,90,100};
          // "LIN Interp OPERATING LIMIT FUNCTION - XY LIMIT ARRAY"  XYlim
        double XYlim[11][11]={0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0,
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0
    0.0,10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0};
    // Print-Out on console "XY LIMIT ARRAY"  XYlim
          for (j=0;j<12;j++){             
            for (i=0;i<10;i++){
             cout<< XYlim[i][j] << " "; //Display the curve
                }
          cout << endl;
          }
          // Input X, ensure it is in the range.
          cout<<endl<< "Please enter X value:";
          cin>>X;     
          while (X >100.0 || X<0.0){
                      cout<<endl<< "Your X value is either greater than 100.0 or smaller than 0.0, Please re-enter again:";
                cin>>X;
                }
          // Input Y, ensure it is in the range.
        cout<<endl<< "Please enter Y value:";
          cin>>Y;
          while (Y >100.0 || Y<0.0){
                      cout<<endl<< "Your Y value is either greater than 100 or smaller than 0, Please re-enter again:";
                cin>>Y;
                }     
          cout<<endl<< "    X="<<X<< ".    Y="<<Y<<endl<<endl;
    
          //Select the correct X0&Y0, X1&Y1
              for (i=0;i<10;i++){ 
                if (X >= TX[i]) X0=i;
                else break;
          }
          X1=X0+1;
    
        for (j=0;j<12;j++){ 
                if (Y >= SPD[j]) Y0=j;
                else break;
          }
          Y1=Y0+1;
    
          cout<< "    X0="<<X0<< ".    X1="<<X1<<"   i="<<i<<endl;
        cout<< "    Y0="<<Y0<< ".    Y1="<<Y1<<"   j="<<j<<endl<<endl;
    
          cout<< "    KGV_X0["<<X0<<"]="<<TX[X0]<< "    KGV_X1["<<X1<<"]="<<TX[X1]<<endl;   
          cout<< "    SPD_Y0["<<Y0<<"]="<<TY[Y0]<<"    SPD_Y1["<<Y1<<"]="<<TY[Y1]<<endl<<endl;
    
          cout<< "    XYlim["<<X0<<"]["<<Y0<<"]="<<XYlim[X0][Y0]<<endl;
          cout<< "    XYlim["<<X1<<"]["<<Y0<<"]="<<XYlim[X1][Y0]<<endl;
          cout<< "    XYlim["<<X0<<"]["<<Y1<<"]="<<XYlim[X0][Y1]<<endl;
          cout<< "    XYlim["<<X1<<"]["<<Y1<<"]="<<XYlim[X1][Y1]<<endl<<endl;
          //calculate F(X,Y), and print-out on console.
        //Using one equation to calculate F(X,Y).  The problem with this one equation method is if X0 = X1, then most of the equation's products go to zero.
          //To see this problem, enter an known X value like 48.  Then enter a Y value that is not known or on the curve.  Example would be X=48 and Y=92.5
          //The 3-equation result will be the correct value of 9.1815, the single equation result will be the result of X=48 and Y=90 or 8.672
        FxyOld=XYlim[X0][Y0]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y0]-XYlim[X0][Y0]))+
                ((Y-TY[Y0])/(TY[Y1]-TY[Y0])*(X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y1]-XYlim[X0][Y1]-XYlim[X1][Y0]+XYlim[X0][Y0]));
       //Using 3 equations to calculate F(X,Y).  Using this method prevents the problem that occurs when X0 = X1 and Y0 does not equal Y1.
       Fxy0=XYlim[X0][Y0]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y0]-XYlim[X0][Y0]));
       Fxy1=XYlim[X0][Y1]+((X-TX[X0])/(TX[X1]-TX[X0])*(XYlim[X1][Y1]-XYlim[X0][Y1]));
       Fxy=Fxy0+((Y-TY[Y0])/(TY[Y1]-TY[Y0])*(Fxy1-Fxy0));
    
       cout<< "    Fxy["<<X<<"]["<<Y<<"]= "<<Fxy<<"   (3-equation result)"<<endl<<endl;//Three equation result to screen
       cout<< "    FxyOld["<<X<<"]["<<Y<<"]= "<<FxyOld<<"   (1-equation result)"<<endl<<endl;    //Single equation result to screen
       goto label1;  //Start program over
          return 0;
            {

  6. #6
    GCDEF is offline Elite Member Power Poster
    Join Date
    Nov 2003
    Posts
    12,120

    Re: Linear equation/interpolation - basic compile errors

    Is showing the line that causes the error really too much to ask? Without PACRXPlc.h we can't compile it an reproduce your issue.

  7. #7
    Join Date
    Apr 1999
    Posts
    27,433

    Re: Linear equation/interpolation - basic compile errors

    Code:
    return 0;
    {
    Why are you using an opening brace here?
    Code:
    #include "PACRXPlc.h"  /* Include file applicable for all targets */
    What is this header?
    Code:
    int Gefmain =(){
    Explain what that line above does. I've never seen anything like it in C++.
    Code:
    T_INT16 *X, T_INT16 *X0, T_INT16 *X1, T_INT16 *X2, T_INT16 *Y0, T_INT16 *Y1, T_INT16 *Y2, T_INT16 *Z1)
    This is completely wrong.

    Assuming that T_INT16 is a type, then you must use semicolons between the declarations if you're going to declare the variables that way:
    Code:
    T_INT16 *X;
    T_INT16 *X0; 
    T_INT16 *X1; 
    T_INT16 *X2; 
    T_INT16 *Y0; 
    T_INT16 *Y1;
    T_INT16 *Y2; 
    T_INT16 *Z1;
    Also, remember that your code has runtime and logic errors, as I stated previously. So even if you get your program to compile, you have to address those issues.

    Regards,

    Paul McKenzie

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