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 2022-11-22

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回答： Image Analyst 2022-11-22

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

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KSSV 2022-11-22

What have you attempted for this simple question?

Myo Min 2022-11-22

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.

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Answer 1

Image Analyst 2022-11-22

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在 MATLAB Online 中打开

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

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Answer 2

Image Analyst 2022-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1858923-i-am-a-beginner-and-this-is-just-a-short-question-how-can-i-input-the-matrice-x-1-0-5-10-into-an#answer_1107683

在 MATLAB Online 中打开

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.

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Myo Min 2022-11-22

Thanks for the sample, Sir.

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