for

language keyword for loops

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 is similar 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.

According to the Code Conventions for the Scilab Programming Language it is recommended:

• Start each statement on a new line.
• Write no more than one simple statement per line.
• Break compound statements over multiple lines.

For example, use:

for i = 1:5
    `disp`_(i);
end

rather than

for i = 1:5 `disp`_(i); end

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 while keyword
• end end keyword
• do language keyword for loops