Problem with Split()

doug

in Integration and Hardware • 1 month ago

Im writing a processing program to display data from an accelerometer using P3D. The data is sent over serial from a Launchpad in the format "xAngle,yAngle". Im trying to split the string to an int[] but the result of the the array always leaves the second element of the array blank.

Here is the code from the Launchpad:

const int xpin = A0; // x-axis of the accelerometer
const int ypin = A3; // y-axis
void setup(){
// initialize the serial communications:
Serial.begin(9600);
}
void loop(){
// print the sensor values:
Serial.print(analogRead(xpin));
Serial.print(",");
Serial.print(analogRead(ypin));
Serial.println(); // print out linefeed
// delay before next reading:
delay(100);
}

Here is the code in Processing:

import processing.serial.*;
Serial myPort; // The serial port
int xVal;
int yVal;
int lf = 10;
String inString;
int[] xList;
float xAng,yAng;
void setup() {
size(400,400,P3D);
println(Serial.list());
myPort = new Serial(this, Serial.list()[0], 9600);
myPort.bufferUntil(lf);
stroke(255);
}
void draw() {
background(0);
text("received: " + inString, 10,50);
xList = int(inString.split(","));
println("String = "+ inString);
println("Array = "+xList[0]+","+xList[1]);
xAng = map(xList[0],350,560,0,PI*2);
directionalLight(51,102,126,+1,0,-1);
translate(width/2, height/2, 0);
fill(200);
rotateX(xAng);
box(80);
}
void serialEvent(Serial p) {
inString = myPort.readString();
}

Here is the resulting ouput from the console:

String = 442,465
Array = 442,0

I can't figure out why xList[1] is 0. Ive tried this code as a test and it works fine.

String myString = "100,200";
int[] xList;
xList = int(split(myString,','));
println("X: "+xList[0]);
println("Y: "+xList[1]);

Replies(5)

Chrisir

Re: Problem with Split()

1 month ago

what is the length of inString?

maybe there is a space or carriage return at the end?

Greetings, Chrisir

If you need an answer, please send me a personal message since this forum doesn't notify.

doug

Re: Problem with Split()

1 month ago

The length of inString is 9. Which is a little odd cause when it print it looks like 442,261

GoToLoop

Re: Problem with Split()

1 month ago

Dunno what's wrong. However I've noticed something:
@ line #23, rather than using Processing's own split() function, you chose to directly use String's one.
Dunno if that makes any difference though.

And there's a common pitfall:
If there's any empty space before a value, the int() function fails to convert that to int.

doug

Re: Problem with Split()

1 month ago

Yea I used java split to as a work around. I get the exact same thing if I use processing or java split.

doug

Re: Problem with Split()

1 month ago

Solved!

In the launchpad code i changed the delimiter in the string to be a space instead of a comma, and then in the processing code I changed

xList = int(inString.split(","));

xList = int(splitTokes(inString));

and now the second element of the array get a value.

Thanks to every who helped!

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