Help clearing up "Unrecognized function or variable 'dt'."

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Natalie Spalding
Natalie Spalding 2021-2-27
评论： Jan 2021-2-27
%% Problem 2 Linear Actuator
t0=0;
tf=0.1;
ft=0.001;
tspan=[t0:dt:tf]; %This is where I'm getting the error "Error in ProgramName(line 49)tspan=[t0:dt:tf];Unrecognized function or variable 'dt'."
x0=0;
xdot0=0;
i0=0;
IC=[x0 xdot0 0];
[t,z]=ode45(@actuator_ode,tspan,IC,[]);
x=z(:,1);
curr=z(:,3);
subplot(2,1,1)
plot(t,curr)
subplot(2,1,2)
plot(t,x)

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-2-27
编辑：Cris LaPierre 2021-2-27
Based on the code you've shared, and the error message you are getting, you have not defined the variable dt that you are using to create tspan. You need to either replace dt with a numeric value, or first define dt.
tspan=[t0:0.1:tf];
% or
dt = 0.1;
tspan=[t0:dt:tf];
  1 个评论
Jan
Jan 2021-2-27
t0:dt:tf is a vector already. There is no need to include it in Matlab's operator [] for concatenating arrays.

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