Plot inside a for loop

hi all, I need your help. I am trying to plot a graph inside a for loop but only dots is appearing on the plot. the dots are not link with each other here is my code:

how can I make a clear line graph with all the dots joined. Help me please its urgent!!!

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Kostas]

well, it is like that because you don't create the x vector,it is just a value. You could try one of the both

x=0:1:250; %create x vector
x=x'; % transpose to be a column vector
s=size(x,1); % size of x

for i=1:s %loop over all values of x
a(i)=x(i)*...;
b(i)=x(i)*...;
.
y(i)=a(i)+b(i);
end
plot(x,y)

or instead of loop create a and b vectors direct

x=0:1:250; %create x vector
x=x'; % transpose to be a column vector
a=x*...; 
b=x*...;
y=a+b;
plot(x,y)

[Yogesh Mangar]

thanks

Answer 2

[saima]

because each time loop runs your value of x and y becomes a scaler. try to use other variable than x and try to accumulate the values and then use the plot outside the loop

[saima]

can help you elaborately if you explain your code in a little detail

[Kostas]

try something like this

k=0; %initialize k

for x = 0:250

.

k=k+1 %raise k value +1 in each iteration

a(k) = x * ....;

b(k) = x * ....;

.

y(k) = a + b; % accumulate all values to the vector y, has the same size like x vector

end

x=x(:);

plot(x,y) %x and y are vectors