Reading arrays from a text file (Please Help)!

Programming Questions

betaigo

Reading arrays from a text file (Please Help)!

in Programming Questions • 4 months ago

Hi

I'm having difficulties with reading an array from a text file (segg.txt) .
I will try to explain what i'm trying to do, but i am a complete programming noob :(.

So i have a text file with data in it that looks like this:

timepoint C C# D D# E F F# G G# A A# B

0.00 1.00 0.94 0.23 0.18 0.13 0.13 0.13 0.11 0.11 0.13 0.14 0.28

0.36 0.01 0.03 0.01 0.01 0.03 0.02 0.04 0.07 0.13 1.00 0.01 0.01

0.77 1.00 0.03 0.01 0.01 0.03 0.01 0.04 0.06 0.05 0.82 0.02 0.03

1.13 1.00 0.02 0.01 0.01 0.51 0.03 0.08 0.12 0.08 0.53 0.03 0.05

What i'm trying to accomplish is the following:
Each note (C, C#, D, D#, E, F, F#, G, G#, A, A#, B) i would like to link a led connected to an arduino (i have already uploaded the firmata to arduino).
When a note hits "1" at a certain point of time (timepoint) i would like the corresponding led to turn on. Offcourse this led turns off when the next note is playing.

I have found that i can read the text file with following code:

String[] lines = loadStrings("segg.txt");

println("there are " + lines.length + " lines");

for (int i=0; i < lines.length; i++) {

println(lines[i]);

}

However this will just print out the entire text file, but it will not divide the array's parameters.

I REALLY hope someone can help me with this! :(

Here is some code that describes which arduino outputs i am using:

Arduino arduino;
int trilmodule1 = 30;
int trilmodule2 = 31;
int trilmodule3 = 32;
int trilmodule4 = 33;
int trilmodule5 = 36;
int trilmodule6 = 37;
int trilmodule7 = 38;
int trilmodule8 = 39;
int trilmodule9 = 40;
int trilmodule10 = 41;
int trilmodule11 = 42;
arduino = new Arduino(this, Arduino.list()[0], 57600);
arduino.pinMode(trilmodule1, Arduino.OUTPUT);
arduino.pinMode(trilmodule2, Arduino.OUTPUT);
arduino.pinMode(trilmodule3, Arduino.OUTPUT);
arduino.pinMode(trilmodule4, Arduino.OUTPUT);
arduino.pinMode(trilmodule5, Arduino.OUTPUT);
arduino.pinMode(trilmodule6, Arduino.OUTPUT);
arduino.pinMode(trilmodule7, Arduino.OUTPUT);
arduino.pinMode(trilmodule8, Arduino.OUTPUT);
arduino.pinMode(trilmodule9, Arduino.OUTPUT);
arduino.pinMode(trilmodule10, Arduino.OUTPUT);
arduino.pinMode(trilmodule11, Arduino.OUTPUT);
void resetSensors() {
arduino.digitalWrite(trilmodule1, Arduino.LOW);
arduino.digitalWrite(trilmodule2, Arduino.LOW);
arduino.digitalWrite(trilmodule3, Arduino.LOW);
arduino.digitalWrite(trilmodule4, Arduino.LOW);
arduino.digitalWrite(trilmodule5, Arduino.LOW);
arduino.digitalWrite(trilmodule6, Arduino.LOW);
arduino.digitalWrite(trilmodule7, Arduino.LOW);
arduino.digitalWrite(trilmodule8, Arduino.LOW);
arduino.digitalWrite(trilmodule9, Arduino.LOW);
arduino.digitalWrite(trilmodule10, Arduino.LOW);
arduino.digitalWrite(trilmodule11, Arduino.LOW);
// PARTICLE / PITCH (locatie van particle)
// HIER VIBREREN
if (physics.numberOfParticles() < MAX_PARTICLES ) {
float yvel = map(constrain(size, 0, 140), 0, 140, 1, -10);
int t = 0;
for (int pitch = 0; pitch < 12; pitch++) {
float pval = seg.getPitches()[pitch];
if (pval > .25) {
t++;
println(pval);
int numParticles = (int) (constrain(size * pval, 0, 50));
for (int i = 0; i < numParticles; i++) {
if(pval < 0.30 && pval > 0 ){
resetSensors();
arduino.digitalWrite(trilmodule1, Arduino.HIGH);
} else if (pitch < 0.36 && pval > 0.30){
resetSensors();
arduino.digitalWrite(trilmodule2, Arduino.HIGH);
} else if (pitch < 0.40 && pval > 0.36){
resetSensors();
arduino.digitalWrite(trilmodule3, Arduino.HIGH);
} else if (pitch < 0.42 && pval > 0.40){
resetSensors();
arduino.digitalWrite(trilmodule4, Arduino.HIGH);
} else if (pitch < 0.50 && pval > 0.42){
resetSensors();
arduino.digitalWrite(trilmodule5, Arduino.HIGH);
} else if (pitch < 0.60 && pval > 0.50){
resetSensors();
arduino.digitalWrite(trilmodule6, Arduino.HIGH);
} else if (pitch < 0.65&& pval > 0.60){
resetSensors();
arduino.digitalWrite(trilmodule7, Arduino.HIGH);
} else if (pitch < 0.70 && pval > 0.65){
resetSensors();
arduino.digitalWrite(trilmodule8, Arduino.HIGH);
} else if (pitch < 0.75 && pval > 0.70){
resetSensors();
arduino.digitalWrite(trilmodule9, Arduino.HIGH);
} else if (pitch < 0.80 && pval > 0.75){
resetSensors();
arduino.digitalWrite(trilmodule10, Arduino.HIGH);
} else if (pitch < 0.90 && pval > 0.80){
resetSensors();
arduino.digitalWrite(trilmodule11, Arduino.HIGH);
} else if (pitch < 1.5 && pval > 0.90){
resetSensors();
// arduino.digitalWrite(trilmodule12, Arduino.HIGH);
}

Replies(2)

GoToLoop

Re: Reading arrays from a text file (Please Help)!

4 months ago

Function loadString() loads a file and separates each line of it into a String[].

But then, to separate each element from the result lines, you have to use split() or splitTokens().

Also, you can convert the whole result String[] into float[] or int[] using conversion functions float() or int().

Here's an example how:

// http://forum.processing.org/topic/reading-arrays-from-a-text-file-please-help

final String[] noteLines = loadStrings("segg.txt");
println("There are " + noteLines.length + " lines");

for (int row = 0; row != noteLines.length; row++) {
  println("\n\n" + noteLines[row]);

  final float[] noteFields = float( splitTokens(noteLines[row]) );

  for (int col = 0; col != noteFields.length; col++)
    print(noteFields[col] + ", ");
}

exit();

janjacobsv

Re: Reading arrays from a text file (Please Help)!

4 months ago

This is a piece of script i often use when importing 2d csv arrays, basic principle should be the same

void importCSV(String fileName, String [][] outArray ) {
//for importing csv files into a 2d array
//by che-wei wang, modified by Jan Jacobs
String lines[] = loadStrings(fileName);
   int csvWidth=0;

//calculate max width of csv file
for (int i=0; i < lines.length; i++) {
    String [] chars=split(lines[i], ';');
    if (chars.length>csvWidth) {
      csvWidth=chars.length;
    }
}

//create csv array based on # of rows and columns in csv file
   //parse values into 2d array
for (int i=1; i < lines.length; i++) {
    String [] temp = new String [lines.length];
    temp= split(lines[i], ';');
    for (int j=0; j < temp.length; j++) {
      outArray[i][j]=temp[j];
      //println(outArray[i][j]);
    }
}
}

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