Spectrum analyser with WS2812B serpentine led matrix

i new arduino coding. built 10*10 led matrix ws2812b leds , fastled library, looks awesome example sketches. decided make spectrum analyser matrix using arduino nano , found code on instructibles(instruction):

code: [select]

/*
written fischimc , supastefe

this sketch uses 10x10 rgb led-matrix spectrum analyzer
it uses ftt library analyze audio signal connected the
pin a7 of arduino nano. everytime column gets higher than
10 pixels color of each column changes.
*/

#define log_out 0         //set output of fft library linear not logarithmical
#define lin_out 1
#define fft_n 256         //set 256 point fft

#include <fft.h>          //include fft library
#include <fastled.h>      //include fastled library
#include <math.h>         //include library mathematic funcions
#define data_pin 3        //data pin leds connected
#define num_leds 100      //amount of leds in matrix
crgb leds[num_leds];
float faktoren[10] = {1, 1.1, 1.15, 1.25, 1.45, 1.55, 1.75, 1.8, 2, 3};       //factors increase height of each column
unsigned char hs[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};                        //height of each column
float hue = 0;                                                                //hue value of colors

void setbalken(unsigned char column, unsigned char height){                   //calculation of height of each column
    unsigned char h = (unsigned char)map(height, 0, 255, 0, 10);
    h = (unsigned char)(h * faktoren[column]);
    if (h < hs[column]){
        hs[column]--;
    }
    else if (h > hs[column]){
        hs[column] = h;
    }
   if (height > 250){
      hue+=2;                     //change value if want difference between colors bigger
      if(hue > 25) hue=0;
   }

    for(unsigned char y = 0; y < 10; y++){                          //set colors of pixels according column , hue
       if(hs[column] > y){
        leds[y+(column*10)] = chsv((hue*10)+(column*10), 255, 200);
       } else {
        leds[y+(column*10)] = crgb::black;
       }
    }
}

unsigned char grenzen[11] = {0,3,5,7,9,11,13,16,24,32,69};          //borders of frequency areas

void setup() {
  fastled.addleds<ws2812b, data_pin, grb> (leds, num_leds);
  serial.begin(115200);                                             //use serial port
  timsk0 = 0;                                                       //turn off timer0 lower jitter
  adcsra = 0xe5;                                                    //set adc free running mode
  admux = 0b01000111;                                               //use pin a7
  didr0 = 0x01;                                                     //turn off digital input
  analogreference(external);                                        //set aref external
}

void loop() {
  while(1) {                                                        //reduces jitter
    cli();                                                          //udre interrupt slows way down on arduino1.0
    (int = 0 ; < 512 ; += 2) {                            //save 256 samples
      while(!(adcsra & 0x10));                                      //wait adc ready
      adcsra = 0xf5;                                                //restart adc
      byte m = adcl;                                                //fetch adc data
      byte j = adch;
      int k = (j << 8) | m;                                         //form int
      k -= 0x0200;                                                  //form signed int
      k <<= 6;                                                      //form 16b signed int
      fft_input[i] = k;                                             //put real data bins
    }

    fft_window();                                                   // window data better frequency response
    fft_reorder();                                                  // reorder data before doing fft
    fft_run();                                                      // process data in fft
    fft_mag_lin();                                                  // take output of fft
    sei();

    fft_lin_out[0] = 0;
    fft_lin_out[1] = 0;

    for(unsigned char = 0; < 11; i++){
      unsigned char maxw = 0;
        for(unsigned char x = grenzen[i]; x < grenzen[i+1];x++){
 
           if((unsigned char)fft_lin_out[x] > maxw){
            maxw = (unsigned char)fft_lin_out[x];
           }
        }

      setbalken(i, maxw);
      serial.print(maxw);
      serial.print(" ");
    }
    serial.println("");
    timsk0 = 1;
    fastled.show();
    timsk0 = 0;
  }
}

but code fits matrix pixels laid in 1 direction , matrix made serpentine layout(every column upside down). found example matrix serpentine layout can't figure out change in first code match matrix.

what suggest?

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