@Pratap Kumar Behera,@Bhaskar Mondal

this code from your papers"A secure image encryption scheme based on a novel 2D sine–cosine cross-chaotic (SC3) map"

please fix my error.

I have this problem in mode function :"Error using mod

Arguments must be real.

Pos=mod(xx,s);"

I need " Pos " to be value from 1 to size of image ( integer value , I need use it as index in confusion phase)

for simplicity say s equal 500 , so I need sequence from 1 to 500

%-------------------------code---------------------------

clc;

clear all;

img=img = imread('lena.bmp');

[row,col]=size(img);

s=row*col;

x=nan(1,s+1); %