Question: "Is this triangle right-angled?" - where can I find functions and their uses/learn about the program outside of class
2 vues (au cours des 30 derniers jours)
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So the question I have to answer is:
"Given three positive numbers a, b, c, where c is the largest number, return true if the triangle with sides a, b and c is right-angled. Otherwise, return false."
This is my solution which doesn't work.
function flag = isRightAngled(a, b, c)
flag = true
function flag ~= isRightAngled(a, b, c) flag = false;
end
The first part of the code works fine, and flag returns true when I run the code through test suite on cody courseworks, bolded code is what I added and doesn't work - which I need help with!
Thanks
2 commentaires
Roger Stafford
le 3 Mar 2017
Modifié(e) : Roger Stafford
le 3 Mar 2017
Consult the pythagorean theorem
Stephen23
le 3 Mar 2017
Modifié(e) : Stephen23
le 3 Mar 2017
And the line
function flag ~= isRightAngled(a, b, c) flag = false;
is not MATLAB syntax at all. Read the code help (red/orange underlines): they will help you to figure out why this is not valid syntax. Some of the problems in that line are:
- trying to define a nested function without a matching end.
- trying to define a function and allocate its output using ~=.
- Recursive function calling without any limits.
I suspect that none of these were intentional. To fix this you need to how to call functions, and how this is different to defining functions:
Réponses (5)
Lewis Pole
le 3 Mar 2017
1 commentaire
Walter Roberson
le 3 Mar 2017
if a^2 + b^2 == c^2
... except you need to allow for round-off error.
Jan
le 3 Mar 2017
d = a^2 + b^2 - c^2;
Now you cannot expect this to be exactly zeros due to the limited precision of floating point values in the double format. But you can check, if the result is "really small". See the command eps(x). The argument of eps() is important for the magnitude of the limit.
0 commentaires
Lewis Pole
le 3 Mar 2017
1 commentaire
Stephen23
le 3 Mar 2017
Modifié(e) : Stephen23
le 3 Mar 2017
"I'm just wanting to know more about code"
That is a great idea! The best place to start is by working through the introductory tutorials:
There are also video tutorials:
You will also find hundreds of online tutorials for getting started with MATLAB.
Star Strider
le 3 Mar 2017
I would add a sort call, since the three sides could be input in any order:
a = rand; % Input Argument
b = rand; % Input Argument
c = rand; % Input Argument
sides = sort([a b c]); % Sort To Determine Order
test = sides(3)^2 - sides(2)^2 + sides(1)^2; % Check Pythagorean Theorem
flag = abs(test < 1E-4); % Allow For Small Errors
1 commentaire
Walter Roberson
le 16 Jan 2022
test = sides(3)^2 - sides(2)^2 - sides(1)^2; % Check Pythagorean Theorem
maybe ?
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