Why am I getting "Array indices must be positive or integers values"?

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Edgar Soriano
Edgar Soriano 2020-9-28
评论： Star Strider 2020-9-29
This is a sine function, which should give me positive and negative values.
syms t
t = 0:0.02:2;
om = 10;
% Steady State Response
up(t)=(100/(400-om^2))*sin(om*t);
plot(t,up(t))
xlabel('Time (sec)')
ylabel('Displacement (in)')
title('Displacement vs Time Response')
Array indices must be positive integers or logical values.
Error in HW5plot (line 6)
up(t)=(100/(400-om^2))*sin(om*t);

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采纳的回答

Star Strider
Star Strider 2020-9-28
Rhe reason is that ‘up(t)’ was being interpreted as an indexing operation rather than a function call, and ‘t’ are not all positive integers. The plot call was also inappropriate.
Try this:
syms t
om = 10;
% Steady State Response
up(t)=(100/(400-om^2))*sin(om*t);
figure
fplot(up, [0 2])
xlabel('Time (sec)')
ylabel('Displacement (in)')
title('Displacement vs Time Response')
.

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