Make a histogram from data read from file

stinie555

Hello! Im new to processing, trying to learn on my own.. Im doing some exercises, but this one got me stuck. I have a .csv file with 12 values in it, and im supposed to make a histogram (bar graph) from these values. Can anyone please tell me how to do that?

The values are both + and - so that means the graph cannot start at a 0 value.. it also has to show the negative values.

This is the code i got so far (might be all wrong!)

int[] data;

void setup(){
 size(500,500);
 background(255);
 fill(255,0,0,30);

 String[] grader=loadStrings("grader.csv");
 data= int(split(grader[0],","));
 //println(grader[0]);


}

void draw(){
 for (int x=0; x < data.length; x++){
  rect(5,100,20,height-data[0]);
 } 
}

TfGuy44

int[] data = {5,20,25,60,30,80,2,1,0,90,100,180};

void setup() { 
  size(500, 500); 
  background(255); 
  fill(255, 0, 0, 30);
  //String[] grader=loadStrings("grader.csv"); 
  //data= int(split(grader[0], ",")); //println(grader[0]);
}

void draw() { 
  for (int x=0; x < data.length; x++) { 
    rect(25*x, height-data[x], 20, data[x]);
  }
}

stinie555

Thanks, but i need to load the values to be used in the graph from the file grader.csv.. thats where the problem comes inn.. cos when i do that it only displays one graph..

GoToLoop

Perhaps take a look at here too?: 3:-O
http://forum.processing.org/two/discussion/404/cant-read-y-axis-of-loadstring#Item_6

TfGuy44

Oh, sorry. It's tough to spot issues in code you can't run.

  String[] grader=loadStrings("grader.csv");
  String[] lineOne = grader[0].split(",");
  for(int i=0; i<lineOne.length;i++){
    data[i] = int(lineOne[i]);
  }