moving an image across the screen along some vector path

hey Ive been trying to move an image of the avatar across the screen and can't seem to figure it out. I know how to shift the image using the identity matrix and was wondering if there was a way I could use that to make it move across the screen or any other way that it is possible. Here are some of the function names I have been using and the way that I shifted it. I have attached the image and a converter script that I used.

A= imread('avatar.jpg');

Aout=Jpeg2pointsConverter(A, 15);

plot(Aout(1,:), Aout(2,:),'b.')

[nrows, ncols]=size(Aout);

AA=[Aout; ones(1,ncols)];

S=eye(3)

>> S(1,3)=300

>> A3=S*AA;

>> hold on, plot(A3(1,:), A3(2,:),'r.')

[DGM]

I have no idea what you're trying to do with this, but this whole thing

BB1=BB(:,:,1);
[M, N]= size(BB1);
BB1=double(BB1);
BB2 = 255-BB1; %Invert so white is 0 instead of 255
BB3 = (BB2 > THRESHOLD);  %Any point with high value is replaced by 1, and 
%any point with a low value is replaced by 0                
PP=zeros(2,M*N);
cnt=0;
for ii=1:M,
    for jj=1:N, 
        if (BB3(ii,jj)>0.5), 
            % this is going to return nonsense indices
            % once you change the aspect ratio
            PP(:,cnt+1)=[jj;N-ii]; 
            cnt=cnt+1;
        end,
    end,
end
PPout = PP(:,1:cnt);

can be replaced with this

[rows cols]=find(BB(:,:,1)<(255-threshold));
PPout=[cols; rows];

I don't know why you're returning all the row indices backwards, but i guess you could still do that

[rows cols]=find(BB(:,:,1)<(255-threshold));
PPout=[cols; size(BB,1)-rows];

Answer 1

[LO]

try using circshift

https://de.mathworks.com/help/matlab/ref/circshift.html