for (var y = 0.0; y < noiseTex.height; y++) {
	for (var x = 0.0; x < noiseTex.width; x++) {
		// Get a sample from the corresponding position in the noise plane
		// and create a greyscale pixel from it.

		//X coord from map
		var xCoord = xOrg + x / noiseTex.width * scale;
		//Y coord from map
		var yCoord = yOrg + y / noiseTex.height * scale;
		//Gets the perlin noise value for a given (x,y) coordinate
		var sample = Mathf.PerlinNoise(xCoord, yCoord);
		//Fills a pixel array with data generated by the perlin noise
		pix[y * noiseTex.width + x] = new Color(sample, sample, sample);
	}
}

//For your use:

for (var y = 0.0; y < map.height; y++) {
	for (var x = 0.0; x < map.width; x++) {
		//Gets the perlin noise value for a given (x,y) coordinate
		var sample = Mathf.PerlinNoise(x, y);
		//Fills a pixel array with data generated by the perlin noise
		mapArray[y*map.width + x] = sample;
	}
}