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Type Conversion (Read 1438 times)
clsnyder
Type Conversion
Jan 17th, 2008, 5:44am  
Hi

Just starting to learn processing from the recent book. I'm trying to use financial data from the yahoo quotes url to graphically display price changes etc (as a learning tool). I have a very basic question - I can get the price data for a stock (eg. GOOG) , but it is of String type, and I can't convert it into float type to draw a graphic object with...


String URL = "http://finance.yahoo.com/d/quotes.csv?s=GOOG&f=p";
String[] data;
//float result = 10.2;
float result = float(data)

void setup(){
 size(100,100);
 data = loadStrings(URL);
 println(data);
// println(data.length);
}

void draw() {
 stroke(255);
 line(50, 90, 50, result);
}

Thanks in advance!

CLS
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steven
Re: Type Conversion
Reply #1 - Jan 17th, 2008, 6:30am  
I'm sure there is an easier way but here's a simple way of doing it. It simply copies each value of the string array and converts it to a float.

Code:
String URL = "http://finance.yahoo.com/d/quotes.csv?s=GOOG&f=p";  
String[] data;
float[] dataConverted;
float result = 10.2;
 
void setup(){
  size(100,100);
  data = loadStrings(URL);  
  println(data);
  
  dataConverted = new float[data.length];
  
  for (int i = 0; i < data.length; i++){
    dataConverted[i] = float(data[i]);
  }
  
  println(dataConverted);
}
 
void draw() {
  stroke(255);
  line(50, 90, 50, result);  
}
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