MATLAB: Using a “while” loop to calculate a factorial

displayfactorialMATLABwhile loop

Use a while loop to calculate f=10!. Display only the final value using the function "disp"

Best Answer

kk = 10;
k = 1;
f = 1;
while k <= kk
    f = k * f;
    k = k + 1;
end
format long
disp(f)

Related Solutions

MATLAB: Converting for loop to while loop

for i =1:5
    j=1;
    k=1;
    while j<=5-i
        fprintf(' ');
        j = j+1;
    end
    while k<=i
        fprintf('*');
        k = k+1;
    end
    fprintf('\n')
end

MATLAB: Command “for” and “while”

Start with the smallest possible problem to understand, what the loops do.

for k = 1:5
   disp(k)
end

Please run this in your command window. Does this explain, what the loop does?

WHILE and FOR loops are equivalent:

k = 1;
while k <= 5
  disp(k);
  k = k + 1;
end

FOR loops are useful, if you know in advance how many iterations you will get. If this is not clear, use a WHILE loop:

iter = 0;
ready = false;
while ~ready
    iter = iter + 1;
    x = input('Type in a number: ');
    if x > 5
       ready = true;
    end
end

Now to your code:

x=[-5:0.1:5];
for N=-5:0.1:5
   y(x)=a*x.^2+b*x+c;
end

[ and ] are the Matlab operator for a concatenation. -5:0.1:5 is a vector already and you concatenate it with nothing. So x=-5:0.1:5 is sufficient already.

y(x) means the x.th element of y. Therefore x must be a positive integer, but this is not the case e.g. for -5 or -4.9 . David has explained this already. One of the solutions:

x = -5:0.1:5;
for k = 1:numel(x)
   y(k) = a * x(k) .^ 2 + b * x(k) + c;
end

You can do this without a loop in Matlab also:

x = -5:0.1:5;
y = a * x .^ 2 + b * x + c;
plot(x, y);

But I assume, the idea of this homework is to learn how to use loops.

Best Answer

Related Solutions

MATLAB: Converting for loop to while loop

MATLAB: Command “for” and “while”

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