Hi,

I have been trying to figure out how to compare the latest input value to the previous input value? I am sure it is very simple but I can't do it and apologise for that.

I have tried something along the lines of:

//Initialise an array of stored values

float[] storedVals = new float[300];
int arrayPosition = 0;

// And then in draw putting the variable into the storedVal array:

storedVals[arrayPosition] = myVariable;
 
// Then an awful attempt at trying to say if the latest variable input is //different to the previous then execute something:

       if (storedVals[1] != storedVals[0]) {
       
//Execute something

Hi PhilLo,

Firstly, my apologies about all the posts over the last few week.

I have tried what you suggested and it is working potentially except that I am getting the correct input variable for one arrayPosition and 0.0 for the other when I use println();

Firstly, I wondered if there was any chance of also understanding your second suggestion which was to create a variable to store the previous value. How would I do this.

Secondly, here is the updated code that is correctly creating an input variable for [arrayPosition-1] but not [arrayPosition]  

  Code:

float myVariable = (d.getValue(1))*100; 

float[] storedVals = new float[300];
int arrayPosition = round(myVariable);

    println(myVariable);
   
     storedVals[arrayPosition] = myVariable;
  arrayPosition++;

  println(storedVals[arrayPosition-1]);
  println(storedVals[arrayPosition]);
  
	   if (storedVals[arrayPosition] > storedVals[arrayPosition-1] ) {

// Execute something 

Hi PhilLo,

Thank you again for the reply. The code that I have attempted to use is probably wrong and is I imagine confusing and it would probably be easier and more clear if I just say what my intention is and provide the Pachube code that I am integrating into my overall sketch.

The Pachube (wind speed data) variable is coming into the sketch every 3.5 seconds. At the basic level I just wanted to store the previous Pachube input and then compare it to the latest variable, and then after compared it and executed something to store the latest variable as the previous variable etc. i.e. to keep comparing the latest variable to the previous variable.

I suppose ideally I would love to take it further and be able to compare a series of variables, but to be honest as it's a rolling input that could continue indefinetely, I wouldn't know how to do that (and perhaps it's the subject of a different post).

Here is the code:
Code:

import eeml.*;

DataIn dIn;

void setup(){
    // e.g. every 15 seconds    
    dIn = new DataIn(this,"http://www.pachube.com/api/feeds/1197.xml", "API KEY HERE", 3500);
}

void draw()
{
    // do whatever needs doing in the main loop
}

// onReceiveEEML is run every time your app receives back EEML that it has requested from a Pachube feed. 
void onReceiveEEML(DataIn d){ 
    float myVariable = d.getValue(1); // get the value of the stream 1
    println(myVariable);
} 

Thank you again PhilLo

Hi PhilLo,

Thank you again for your help!

Cheers