Cannot get the function to draw function

Hello, so we are doing a Fouriers series and we got a script from the teacher to work with. My friends which have different functions to draw made them work, but i for some reason cannot. It gets stuck right at the beginning, so heres the code:

syms t k

T = 6;

w = 2*pi/T;

f1 = exp(-3*t)-2;

f2 = 0;

T1 = 5;

%n = 3;

m = 10;

%----------------------------------------------------------------------------

%Just making sure its calculable

I = int(f1^2,t,0,T1)+ int(f2^2,t,T1,T)

vpa(I)

if I == Inf

error('Not calculable.')

else

fprintf('calculable')

end

%----------------------------------------------------------------------------

%Your function

t1 = 0: 1/10000 : 5;

funkce1 = exp(-3*t)-2;

t2 = 5 :1/10000: 6;

funkce2 = 0*ones(size(t2));

figure(1)

set(gcf,'color','w');

plot(t1, funkce1, 'k', t2, funkce2, 'k')

xlabel('t');

ylabel('f(t)');

title('Zadaná funkce')

grid on

hold on

ylim([-2.5 1.5]);

plot(0,1,'ok', 'MarkerFaceColor','k')

plot(pi/2,1,'ok', 'MarkerFaceColor','k')

plot(pi/2,2,'ok')

plot((3/2)*pi,2,'ok')

The last few bits are left from the teachers version. The error it says to me is: Error using plot

Data must be numeric, datetime, duration or an array convertible to double.

Answer 1

[Martin Placek]

Just to be clear, this is just the part of a code that allows us to plot the function we are supposed to make. Mine is the e function in the f1, it goes from 0 to 6, and then theres a constant 0 from 5 to 6

Answer 2

[Steven Lord]

% t1 = 0: 1/10000 : 5;
% funkce1 = exp(-3*t)-2;

Is funkce1 supposed to use t or t1? I could see it using the symbolic variable t if you wanted to use fplot not plot:

syms t
funkce1_sym = exp(-3*t)-2;
fplot(funkce1_sym, [0 5])

But if you want to plot it numerically:

figure
t1 = 0: 1/10000 : 5;
funkce1_num = exp(-3*t1)-2;
plot(t1, funkce1_num)