How can I fix this Imrotate error in my program?

%% Loading the image into the script

I = imread('DSC00157.jpg');

pause()

imshow(I); title('China is beautiful in color')

pause()

%% Converting I to Grayscale

I_gray = rgb2gray(I);

pause()

imshow(I_gray);

pause()

%% Grayslice Function

map=[0 0 0;0 0 1;1 0 0;1 1 0;1 1 1];

pause()

I_graycolor = grayslice(I_gray,5);

pause()

I_graycolor = imshow(I_graycolor,map);

pause()

%% Rotating the Image

I = I_graycolor;

imrotate(I, 180)

imshow(I)

pause()

figure(2)

title('China is beautiful in grayslice');

imshow(I_graycolor);

pause()

imwrite(I_graycolor,'BA_ce11pic.bmp');

But when I run the code - the last section gets the following error message:

Error in CE11 (line 20)

imrotate(I, 180)

Error using imrotate

Expected input number 1, input image, to be one of these types:

numeric, logical

Instead its type was matlab.graphics.primitive.Image.

Error in imrotate>parse_inputs (line 223)

validateattributes(A,{'numeric','logical'},{},mfilename,'input image',1);

Error in imrotate (line 67)

[A,ang,method,bbox] = parse_inputs(args{:});

Answer 1

[KALYAN ACHARJYA]

imrotate(I, 180);

Where I must be image, But in your case you rotatinng the I_graycolor= imshow(I_graycolor,map); figure window.

If you rotate the indexed or gray scale image it perfectly OK.

Check it works, do the modification for map

I_graycolor = grayslice(I_gray,5);
pause()
%I_graycolor = imshow(I_graycolor,map); 
%% Rotating the Image
I = I_graycolor; 
imrotate(I, 180)