Question about imshow syntax

Hi all,

I have some problems with the 'imshow' syntax. For example if I have the below code :

a=zeros(1,3000)

for i=1:3000

if rand<0.5

    a(1,i)=1;

end

end

imshow(a,'InitialMagnification', 'fit')

Because the matrix is two "long", 3000 columns, so when I use imshow to display, I just see it's a long line. How can I fix this problem, make it bigger ?.

The second question is, when I display it, the place where its value is 1, it's displayed with white dot and the black one for the value 0. If I want to change the dot to any other symbol, for example, triangle, symbol x,.... How can I do that ?

Thanks all in advance

[Jan]

What does "bigger" mean here, when the image has a width of 1 pixel?

Btw., a faster method to create the image:

a = double(rand(1, 3000) < 0.5);

[Son]

I mean if you use the smaller matrix, for example a = zeros(1,100) and then imshow(a), you can see more clearly the element in the matrix than using the bigger matrix, what do you mean a width of 1 pixel

Answer 1

[Jan]

To plot triangles instead of dots, use the plot command and obtain the corrinates by find.

[Son]

"obtain the corrinates by find" I dont really get this one, could you tell more clearly