0 个投票

I am new to matlab and I have some question.Why graph not come out.when I run this code
x = [1 : 0.005 : 4*pi]
y =sin(x)/cos(x);
plot(x,y);
But is work when I change y=sin(x)/cos(x) to y=tan(x) thank you for your answers

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Stephen23
Stephen23 2018-5-3
编辑：Stephen23 2018-5-3
Have a look at the size of y:
>> numel(x)
ans = 2314
>> numel(y)
ans = 1
You need to use element-wise rdivide:
sin(x) ./ cos(x)
^ you need this!
Read more about the differences here:
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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回答（2 个）

0 个投票

Please use this.
x = 1 : 4*pi
y=sin(x)./cos(x);
plot(x,y);
KSSV
KSSV 2018-5-3
编辑：KSSV 2018-5-3

0 个投票

It is very much working:
x = 1:0.005:4*pi ;
y =sin(x)./cos(x);
% y=tan(x) ;
plot(x,y);

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