Knowing when all of the matrix boxes are true

Apoel_95

Hi, I have a Boolean matrix, and let me know when all the boxes are true. how can I do?

Chrisir

Easy

When you mean a 2D grid / 2D array:

Make a new function that returns boolean named allCellsAreTrue :

boolean allCellsAreTrue() {

double/ nested for loop over the grid

Inside of it: if(!matrix [i][j] )

return false;

after both loops (!!!) :

return true;

Chrisir

The ! means not

so as soon as we hit one cell that's false, we leave the function

Only after testing ALL cells we return true

Apoel_95

ok thank you, another thing, if I'm in the draw and I want to execute an istructions only once, as I do?

jeremydouglass

if I'm in the draw and I want to execute an istructions only once

Please provide more information. Some approaches, depending on what you are trying to do:

• Write a simple sketch without a setup and draw loop
• Execute instructions only once in setup(), before draw() starts
• Use noLoop() so that draw() only runs once
• To have something only happen once on a specific draw frame or at a specific time, put an instruction in draw() inside an if() statement. There are many ways of doing this -- such as checking a global variable, or checking millis() or frameCount();

A simple sketch:

println("run only once");

Run during setup:

void setup(){
  println("run only once");
}
void draw(){}

Run with noLoop: [added]

void setup(){
  noLoop();
}
void draw(){
  println("run only once");
}

Run on frame 100:

void draw(){
  if(frameCount==100){
    println("run only once");
  }
}

Run once only:

boolean once;
void draw(){
  if(!once){
    once=true;
    println("run only once");
  }
}

Run once only after 10 seconds:

boolean once;
void draw(){
  if(!once && millis()>10000){
    once=true;
    println("run only once");
  }
}

Apoel_95

thanks you so much

koogs

see also noLoop()