# I am a beginner and this is just a short question. How can I input the matrice x=[-1 0 5 10] into an if statement and use the output to calculate Y?

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Myo Min on 22 Nov 2022
Answered: Image Analyst on 22 Nov 2022
Write a script to do the following
Read a value of a scalar
Then compute & display the value of using the function [y=3x^3-0.9x+5] in case that in range of . If "x" not in this range 0<x<=10, "y" will not be calculated nor displayed.
y=3x^3-0.9x+5 for 0<x<=10
Test the script using the following cases of "x" and then summarize if "y" will be displayed or not .
(a) x = -1
(b) x = 0
(c) x = 5
(d) x = 10
KSSV on 22 Nov 2022
What have you attempted for this simple question?
Myo Min on 22 Nov 2022
I used
x=[-1 0 5 10]
y=3*x.^3-0.9*x+5
if x>0 && x<=10
disp(y)
else
disp("Out of range")
end
And it is not working. When I try to find other answers, I don't understand the other commands.

Image Analyst on 22 Nov 2022
You need to loop over all x if you have x in a vector like that
x = [-1, 0, 5, 10];
for k = 1 : numel(x)
if x(k) > 0 && x(k) <= 10
y = 3 * x(k) .^ 3 - 0.9 * x(k) + 5;
fprintf('y(%d) = %f\n', x(k), y);
else
fprintf("Your x of %.1f is out of range.\n", x(k))
end
end
Your x of -1.0 is out of range. Your x of 0.0 is out of range.
y(5) = 375.500000 y(10) = 2996.000000

Image Analyst on 22 Nov 2022
Hint:
x = input(
if x > 0 && x <= 10
%code
else
%code
end
I'm confident you will be able to figure out the last few characters to complete the assignment.
Myo Min on 22 Nov 2022
Thanks for the sample, Sir.

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