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December 3rd, 2018, 07:06 PM  #1 
Newbie Joined: Oct 2018 From: Turkey Posts: 23 Thanks: 0  matlab plotting and defining range
I have the function in Matlab: y=(2*cos(x)^21)/cos(x) All i want is a simple plot of this. i want x to be from pi to pi for example so i wrote x = pi : pi But when i said plot (x,y) Matlab says: "Error using plot Data must be numeric, datetime, duration or an array convertible to double" Where am i making a mistake? 
December 6th, 2018, 03:01 PM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,765 Thanks: 623 Math Focus: Yet to find out. 
If you want a numeric plot, youâ€™d need to pass x into y first to create a vector. Alternatively you can set x to be symbolic (syms x) and then use fplot(y).


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defining, matlab, plotting, range 
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