What is the meaning of ":"?

HI, this is part of the code that I'm studying about. But I do not quite understand what does each line mean.

Can I ask what does ":" mean?

for example 1:m and -xw:xw

function f=asmf(x)

[m n]=size(x);

a=x;

fl(1:m,1:n)=1;

mw=5;

for i=1:m

for j=1:n

cond=1;

xw=1;

while(cond==1)

co=0;

for k=-xw:xw

for l=-xw:xw

Answer 1

[madhan ravi]

doc colon

[Chew]

Thank you so much for the reply!

[Chew]

also, I do not understand this line. what does "-min" mean?

if (co>0)

if (abs(a(i,j)-min(s))<td)&&(abs(a(i,j)-max(s))<td)

f(i,j)=a(i,j);

else

f(i,j)=median(s);

end

[Steven Lord]

It's a call to the min function the output of which is subtracted from element (i, j) of the array a.