Calculations using for loops

I want to perform the following calculations using for loops. I have assigned values to variables A and B. I want to calculate V, by plugging k=0:0.1:x and setting a condition inside the for loop. If k<=5 calculate V=(-A)(k)+(B*6) and else V=(-A)(k)+(B*6)+(A/B)(k). How can i make it work using for loops and how can i stored every value?

x=input('From zero, until what number do you want to calculate');
A=5;
B=2;
for k=0:0.1:x
        if k<=5
            V=(-A)*(k)+(B*6);
        else
            V=(-A)*(k)+(B*6)+(A/B)*(k)
        end
    V(k)=V;
end

[Sindar]

what error messages?

Answer 1

[Sindar]

Two problems:

• parentheses are not multiplication in matlab, you need *
• you are trying to insert a variable into itself

Solution (edited for modified question):

x=input('From zero, until what number do you want to calculate');
A=5;
B=2;
kvec = 0:0.1:x;
for ind=1:length(kvec)
    if kvec(ind) <= 5
        V(ind)=-A*kvec(ind)+B*6;
    else
        V(ind)=-A*kvec(ind)+B*6+A/B*kvec(ind)
    end
end

[Sindar]

BTW, this can be done without loops or if statements:

V(1:5) = -A*(1:5)+B*6;
V(6:10) = -A*(6:10)+B*6+A/B*(6:10);

[Sindar]

(you can still do it without loops, think about how)