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Topic: Having trouble on solving the following tasks (Read 5444 times) previous topic - next topic

AWOL

You're still missing the point of using the for loop to provide you with indices.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Jonraptor

#46
Oct 04, 2012, 04:17 pm Last Edit: Oct 04, 2012, 04:19 pm by Jonraptor Reason: 1
How am i suppose to announce the indices that i need to call out the printout that i am looking for (say i need  to call out a printout of 25 C with a range between  4030 & 4470) How will i apply that in an index method?

AWOL

#47
Oct 04, 2012, 04:29 pm Last Edit: Oct 04, 2012, 04:33 pm by AWOL Reason: 1
I now cannot work out what you're trying to do.
If you're just filtering for specific values, then you don't need loops at all.

I thought you were using a for loop to give you lookup capabilities, but since you don't use the indices, you're just wasting processing cycles.
I also don't see why you need to iterate over the columns of the table at all.

I see your double increment has crept back in.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Jonraptor

#48
Oct 04, 2012, 04:33 pm Last Edit: Oct 04, 2012, 04:45 pm by Jonraptor Reason: 1

I now cannot work out what you're trying to do.
If you're just filtering for specific values, then you don't need loops at all.

I thought you were using a for loop to give you lookup capabilities, but since you don't use the indices, you're just wasting processing cyles.
I also don't see why you need to iterate over the columns of the table at all.

I see your double increment has crept back in.

That's the whole point of having the for loop...is to use it for lookup capabilities as you have mentioned.

PaulS

Quote
i myself, don't like to use for loops as much to be honest with you.

Because, it appears, you do not understand them. They are really quite simple, and very, very useful. I think it would be worth the effort to understand them.

Jonraptor


Quote
i myself, don't like to use for loops as much to be honest with you.

Because, it appears, you do not understand them. They are really quite simple, and very, very useful. I think it would be worth the effort to understand them.


Yes, i do know how to use them..but i don't know why do i need to use indeces for my if statements. This is the major problem that i am currently facing at this moment.

tuxduino

Quote
Yes, i do know how to use them


No you don't. If you knew, you'd scream seeing those i++ and j++ repeated at the end of the for code block.

Quote
but i don't know why do i need to use indeces for my if statements. This is the major problem that i am currently facing at this moment.


If you don't know why you should use them, then probably you don't need them. ;)

Jonraptor


Quote
Yes, i do know how to use them


No you don't. If you knew, you'd scream seeing those i++ and j++ repeated at the end of the for code block.

Quote
but i don't know why do i need to use indeces for my if statements. This is the major problem that i am currently facing at this moment.


If you don't know why you should use them, then probably you don't need them. ;)

What are you on about? i have removed those codes a while ago. and Still prints out the results based on the increments by 4-5 times based on the table.
Also, if i don't need the indeces, then what's the point of using the for loop then :S?

PaulS

Quote
i have removed those codes a while ago.

They were still there in the last code you posted. You can hardly expect us to keep trying to help you if you are changing code without telling us.

tuxduino

Quote
What are you on about? i have removed those codes a while ago.


Please read again your reply #44.

PaulS

Changing code that you posted a while ago is a dirty trick. Please do not do that again. Post the code in a new reply.

Jonraptor

#56
Oct 04, 2012, 05:16 pm Last Edit: Oct 04, 2012, 05:19 pm by Jonraptor Reason: 1
Here is my modified version of my code: -
Code: [Select]

const int ThermPin = A0;
const int rows = 10;
const int cols = 2;
int Table[rows][cols] ={   //col 0||col 1
                            { 25, 4470 }, //row 0
                            { 26, 4250 }, //row 1
                            { 27, 4030 }, //row 2
                            { 28, 3800 }, //row 3
                            { 29, 3530 }, //row 4
                            { 30, 3270 }, //row 5
                            { 31, 3200 }, //row 6
                            { 32, 3170 }, //row 7
                            { 33, 3100 }, //row 8
                            { 34, 3070 }  //row 9
                       };   
void setup()
{
  Serial.begin(9600);
}

void loop()
{

float Vin = 5.0;
float ThermResist = 0.0;
float R2 = 10000.0;
float SensorValue = 0.0;
float Vout = 0.0;
                         
  SensorValue = analogRead(ThermPin);
  Serial.print("Value = ");
  Serial.print(SensorValue);
 
  Vout = (((SensorValue+1)*Vin)/1024.0);
  Serial.print("\t Voltage = ");
  Serial.print(Vout);
  Serial.print(" V");
 
  ThermResist =((R2*Vin)/Vout)-R2;
  Serial.print("\t Resistance = ");
  Serial.print(ThermResist);
  Serial.println(" Ohm");
 
  for (int i = 0; i<rows; i++)
  {
   for(int j = 0;j<cols; j++)
   {
      if(ThermResist >= Table[2][1] && ThermResist <= Table[0][1] )
      {
        Serial.print(Table[0][0]);
        Serial.println(" C");     
      }
      if(ThermResist >= Table[4][1] && ThermResist <= Table[3][1] )
      {
        Serial.print(Table[3][0]);
        Serial.println(" C");
      }
      if(ThermResist >= Table[6][1] && ThermResist <= Table[5][1] )
      {
        Serial.print(Table[5][0]);
        Serial.println(" C");
      }
      if(ThermResist >= Table[9][1] && ThermResist <= Table[7][1] )
      {
        Serial.print(Table[9][0]);
        Serial.println(" C");
      }
   }
  }

}


Output of the code(still loops twice as much): -
Code: [Select]

Value = 685.00 Voltage = 3.35 V Resistance = 4927.11 Ohm
Value = 688.00 Voltage = 3.36 V Resistance = 4862.12 Ohm
Value = 693.00 Voltage = 3.39 V Resistance = 4755.04 Ohm
Value = 695.00 Voltage = 3.40 V Resistance = 4712.64 Ohm
Value = 698.00 Voltage = 3.41 V Resistance = 4649.50 Ohm
Value = 701.00 Voltage = 3.43 V Resistance = 4586.89 Ohm
Value = 704.00 Voltage = 3.44 V Resistance = 4524.82 Ohm
Value = 707.00 Voltage = 3.46 V Resistance = 4463.28 Ohm
25 C
25 C
25 C
25 C
25 C
25 C
25 C
Value = 729.00 Voltage = 3.56 V Resistance = 4027.40 Ohm
Value = 733.00 Voltage = 3.58 V Resistance = 3950.95 Ohm
Value = 731.00 Voltage = 3.57 V Resistance = 3989.07 Ohm
Value = 731.00 Voltage = 3.57 V Resistance = 3989.07 Ohm
Value = 733.00 Voltage = 3.58 V Resistance = 3950.95 Ohm
Value = 733.00 Voltage = 3.58 V Resistance = 3950.95 Ohm
Value = 739.00 Voltage = 3.61 V Resistance = 3837.84 Ohm
Value = 737.00 Voltage = 3.60 V Resistance = 3875.34 Ohm
Value = 739.00 Voltage = 3.61 V Resistance = 3837.84 Ohm
Value = 740.00 Voltage = 3.62 V Resistance = 3819.16 Ohm
Value = 740.00 Voltage = 3.62 V Resistance = 3819.16 Ohm
Value = 742.00 Voltage = 3.63 V Resistance = 3781.96 Ohm
28 C
28 C
28 C
28 C
28 C
28 C
Value = 756.00 Voltage = 3.70 V Resistance = 3527.08 Ohm
Value = 756.00 Voltage = 3.70 V Resistance = 3527.08 Ohm
Value = 756.00 Voltage = 3.70 V Resistance = 3527.08 Ohm
Value = 756.00 Voltage = 3.70 V Resistance = 3527.08 Ohm
Value = 768.00 Voltage = 3.75 V Resistance = 3316.00 Ohm
Value = 768.00 Voltage = 3.75 V Resistance = 3316.00 Ohm
Value = 769.00 Voltage = 3.76 V Resistance = 3298.70 Ohm
Value = 771.00 Voltage = 3.77 V Resistance = 3264.25 Ohm
30 C
30 C
30 C
30 C
30 C
30 C
Value = 775.00 Voltage = 3.79 V Resistance = 3195.88 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 775.00 Voltage = 3.79 V Resistance = 3195.88 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 775.00 Voltage = 3.79 V Resistance = 3195.88 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 777.00 Voltage = 3.80 V Resistance = 3161.95 Ohm
34 C
34 C
34 C
34 C
34 C
Value = 775.00 Voltage = 3.79 V Resistance = 3195.88 Ohm
Value = 775.00 Voltage = 3.79 V Resistance = 3195.88 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm
Value = 776.00 Voltage = 3.79 V Resistance = 3178.89 Ohm


Jonraptor


Changing code that you posted a while ago is a dirty trick. Please do not do that again. Post the code in a new reply.

I've changed the code on reply #44 back to where it was. So don't worry about it. Although, i am still concerned on using the for loop

tuxduino

You've fixed the double index increment issue, but you still pointlessly use two nested for()s just to print the same thing multiple times. And you were the first to recognize you didn't understand _why_ you needed those cycles. Can't you see the indices don't play any role in the code of the inner for() block ?

You either use multiple copy-n-pasted if()s, or you use just one and loop through the table's row. (Hint: you need just _one_ loop).

Jonraptor


You've fixed the double index increment issue, but you still pointlessly use two nested for()s just to print the same thing multiple times. And you were the first to recognize you didn't understand _why_ you needed those cycles. Can't you see the indices don't play any role in the code of the inner for() block ?

You either use multiple copy-n-pasted if()s, or you use just one and loop through the table's row. (Hint: you need just _one_ loop).

The indices doesn't do anything on my for loop. Which is why i don't understand why i need a for loop for this task. It would have made more sense if i knew how to use a one loop routine for my for loop.

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