Error using / Arguments must be numeric, char, or logical.

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Antônio Carvalho
Antônio Carvalho 2022-5-22
回答： Image Analyst 2022-5-22
When i input this code :
t=0:1:10;
y=2.718.^(-t/5)-{[2.718.^(-t/5)].*t}/5;
plot(t,y(t))
the program reclaims : Error using /
Arguments must be numeric, char, or logical.
How can i solve this please ?

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回答（2 个）

VBBV
VBBV 2022-5-22
编辑：VBBV 2022-5-22
Ran in:
y=@(t) 2.718.^(-t/5)-(2.718.^(-t/5).*t)/5;
t=0:1:10;
plot(t,y(t))
Define the equation as anonymous function and plot
Image Analyst
Image Analyst 2022-5-22
Ran in:
You can get rid of the (t) in plot. Also get rid of the braces in the definition of y because that puts what's inside of the braces into a cell and you can't subtract a cell from a number. See the FAQ:
https://matlab.fandom.com/wiki/FAQ#What_is_a_cell_array.3F
You can also use exp instead of raising 2.718 to a power. Fixed code:
t = 0 : 10;
y = exp(-t/5) - exp(-t/5) .* t / 5;
plot(t, y, 'b-');
grid on;
xlabel('t');
ylabel('y');

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