subscript error in coding

warborules · #1 27-Nov-2005, 14:12

here are the circumstances:

i have declared the array and the function at the start of the program.
i have declared values for y[i], c, m and x[i]
the equation im trying to achieve is the total sum of (y[i]-c-m(x[i]))^2 for each value of i
the error in salford plato, in c, says "error 116 - Subscript applied to the wrong type of object"
here is the part of the program that matters:

at the declaration point:

CPP / C++ / C Code:

int N, i;

float x[MAX], y[MAX], xsqrd[MAX], txs, sumx, sumx2, D, Exy, Exy2[MAX], Ex, Ey, 
m, c, o2y, o2y3;

void input (float numbers []);
void totxsqrd (float numbers []);
void sumx3 (float numbers []);
void calcD (float numbers []);
void Exy3 (float numbers []);
void Ex2 (float numbers []);
void Ey2 (float numbers []);
void m2 (float numbers []);
void c2 (float numbers []);
void o2y2 (float numbers []);

int main()

{
  float numbers [150];
  input (numbers);
  totxsqrd (numbers);
  sumx3 (numbers);
  calcD (numbers);
  Exy3 (numbers);
  Ex2 (numbers);
   Ey2 (numbers);
      m2 (numbers);
      c2 (numbers);
      o2y2 (numbers);
}

and at the bottom of the program where i am working:

CPP / C++ / C Code:

void o2y2 (float numbers []) /* */
{
  o2y3=((y[i]-c-(m*x[i]))*(y[i]-c-(m*x[i])));
  o2y=0;
  for (i=0; i<=N-1; i++)
  o2y=o2y+o2y3[i];
  printf("\nThe sum of (y-c-mx) all squared is %f\n", o2y);
}

help me, you are cleverer than me!!

warborules · #2 27-Nov-2005, 14:13

basically, where have i gone wrong, there is only one error aparently

warborules · #3 27-Nov-2005, 14:15

oh and the error is in the line which says:

"o2y=o2y+o2y3[i];"

WaltP · #4 27-Nov-2005, 15:03

Please Read the Guidelines

Quote:

Originally Posted by warborules

oh and the error is in the line which says:

"o2y=o2y+o2y3[i];"

o2y3 is not an array....

CPP / C++ / C Code:

float x[MAX], y[MAX], xsqrd[MAX], txs, sumx, sumx2, D, Exy, Exy2[MAX], Ex, Ey, m, c, o2y, o2y3;

Please split your line -- it's too long. Convention is generally around 80 characters but on a forum that value should be shortened some...

warborules · #5 27-Nov-2005, 15:28

could you help me in what to change the coding to? sorry about writing too longer lines-didnt realise

kobi_hikri · #6 27-Nov-2005, 15:50

Quote:

Originally Posted by warborules

help me, you are cleverer than me!!

No, we are not. Don't underestimate yourself

As Walt noticed, you are referring to an element of the array o2y3 at index i - but o2y3 is float and not an array of any type.
Another thing I noticed is that you declared main as int but never return anything. I think it would be better to return the value you promised to return

.

Quote:

Originally Posted by warborules

could you help me in what to change the coding to?

Explain your function's purpose, and supply complete code.

Kobi.

Paramesh · #7 27-Nov-2005, 17:16

Hi warborules,

In this line:

CPP / C++ / C Code:

o2y3=((y[i]-c-(m*x[i]))*(y[i]-c-(m*x[i])));  /* what is the purpose ?? */
  o2y=0;

for (i=0; i<=N-1; i++)
  o2y=o2y+o2y3[i];         /* o2y3 is not an array. that line should be here... */

  printf("\nThe sum of (y-c-mx) all squared is %f\n", o2y);

The line in which you are calculating o2y3 should come inside the for loop.
For example, like this:

CPP / C++ / C Code:

  for (i=0; i<=N-1; i++)
  {
    o2y3=( ( (y[i]-c- (m*x[i]) ) * ( (y[i]-c- (m*x[i]) ) );
    o2y=o2y+o2y3;
  }

Regards,

Paramesh.

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subscript error in coding

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