Color Palette matlab code

This is my first attempt on designing a color palette. Of course, this looks quite simple.

The palette contains primary colors R,G and B.

%size of the square

sz=50;

%Number of rows

xvalue=10;

%Number of Columns

yvalue=10;

%Initialize the matrix with zeros

RGB=zeros([sz+2 sz+2 3]);

%The image shade from darker to lighter.Instead of 255 give values lesser than 255 and see the different shades

v=round(255/yvalue);

clear C

 m=sz+2;

 n=1;

    %The same color repetition. If you specify val=1 then the colors  R,G,B

    %will occur repeatedly

    val=floor(xvalue/3);

   

    inc=1;

for i=1:xvalue

    n1=1;

    m1=sz+2;

    if(inc==1)

        %Red color will be displayed

    num1=20;

    num2=1;

    num3=1;

    elseif(inc==2)

        %Green color will be displayed

    num1=1;

    num2=20;

    num3=1;

    elseif(inc==3)

        %Blue color will be displayed

    num1=1;

    num2=1;

    num3=25;

   

    end

    for j=1:yvalue

        RGB(2:sz+1,2:sz+1,1)=num1*v*j;

        RGB(2:sz+1,2:sz+1,2)=num2*v*j;

        RGB(2:sz+1,2:sz+1,3)=num3*v*j;

       

              

        C(n:m,n1:m1,:)=RGB;

             

        m1=m1+sz;

        n1=n1+sz;

            

      

    end

    n=n+sz;

    m=m+sz;

    if(mod(i,val)==0)

       

        inc=inc+1;

    

        if(inc>3)

            inc=1;

        end

    end

   

   

end

C=uint8(C);

imshow(C);

10X10

5X10