for

Description

Used to define loops. Its syntax is: for variable=expression ,instruction, .. ,instruction,end

for variable=expression do instruction, ,instruction,end

If expression is a matrix or a row vector, variable takes as values the values of each column of the matrix.

A particular case uses the colon operator to create regularly spaced row vectors, and ressemble to traditional for loop forms : for variable=n1:step:n2, ...,end

If expression is a list variable takes as values the successive entries of the list.

Warning: the number of characters used to define the body of any conditional instruction (if while for or select/case) must be limited to 16k.

Examples

// "traditional" for loops
n=5;
for i = 1:n, for j = 1:n, a(i,j) = 1/(i+j-1);end;end
for j = 2:n-1, a(j,j) = j; end; a
for j= 4:-1:1, disp(j),end // decreasing loop

//loop on matrix columns
for  e=eye(3,3),e,end  
for v=a, write(6,v),end        
for j=1:n,v=a(:,j), write(6,v),end 

//loop on list entries
for l=list(1,2,'example'); l,end

See Also

• while
• end
• do