# Plotting time series of Velocity over 48 hours

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John Carroll on 25 Oct 2021
Commented: John Carroll on 25 Oct 2021
I am trying to plot Velocity over a time frame of 48 hours. I have calculated Vm = 5.07. The given Velocity equation is: V(t) = Vm*sin((2*pi*t)/(Ttide));
My code is:
figure(1);
Vm=5.07; % Calculated on Paper
t=[1:1:48]; % Time over 48 hours
V(t) = Vm*sin((2*pi*t)/(Ttide)); % Velocity Equation
plot(t,V(t))
This is outputing a postivie sloping straight line, while I know the line should be sinusoidal.

Scott MacKenzie on 25 Oct 2021
Edited: Scott MacKenzie on 25 Oct 2021
% test value for Ttide (not given in question)
Ttide = 1;
figure(1);
Vm=5.07; % Calculated on Paper
%t=[1:1:48]; % Time over 48 hours
t = linspace(1,48); % use 100 sample points (or more)
V = Vm*sin((2*pi*t)/(Ttide)); % Velocity Equation (NOTE: change V(t) to just V)
plot(t,V) ##### 2 CommentsShowHide 1 older comment
John Carroll on 25 Oct 2021
Ive relized this is where my mistake was made!