Pages: 1 2 3 [4] 5 6   Go Down
Author Topic: Having trouble on solving the following tasks  (Read 3637 times)
0 Members and 1 Guest are viewing this topic.
Global Moderator
UK
Offline Offline
Brattain Member
*****
Karma: 238
Posts: 24322
I don't think you connected the grounds, Dave.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

You're still missing the point of using the for loop to provide you with indices.
Logged

"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.

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
« Last Edit: October 04, 2012, 09:19:54 am by Jonraptor » Logged

Global Moderator
UK
Offline Offline
Brattain Member
*****
Karma: 238
Posts: 24322
I don't think you connected the grounds, Dave.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
« Last Edit: October 04, 2012, 09:33:08 am by AWOL » Logged

"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.

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
« Last Edit: October 04, 2012, 09:45:41 am by Jonraptor » Logged

Seattle, WA USA
Offline Offline
Brattain Member
*****
Karma: 548
Posts: 46029
Seattle, WA USA
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Offline Offline
Edison Member
*
Karma: 26
Posts: 1339
You do some programming to solve a problem, and some to solve it in a particular language. (CC2)
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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. smiley-wink
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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. smiley-wink
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?
Logged

Seattle, WA USA
Offline Offline
Brattain Member
*****
Karma: 548
Posts: 46029
Seattle, WA USA
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Offline Offline
Edison Member
*
Karma: 26
Posts: 1339
You do some programming to solve a problem, and some to solve it in a particular language. (CC2)
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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

Please read again your reply #44.
Logged

Seattle, WA USA
Offline Offline
Brattain Member
*****
Karma: 548
Posts: 46029
Seattle, WA USA
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Here is my modified version of my code: -
Code:
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:
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

« Last Edit: October 04, 2012, 10:19:37 am by Jonraptor » Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

Offline Offline
Edison Member
*
Karma: 26
Posts: 1339
You do some programming to solve a problem, and some to solve it in a particular language. (CC2)
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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).
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 51
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Pages: 1 2 3 [4] 5 6   Go Up
Jump to: