How do I write the following functions on Matlab x(t) = 2tcos(pit) , y(t) = 2sin(pit)

Question

Khalid Tewfik 2016-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/303861-how-do-i-write-the-following-functions-on-matlab-x-t-2tcos-pi-t-y-t-2sin-pi-t

编辑： Walter Roberson 2024-3-3

采纳的回答： KSSV

I keep getting error using * and other errors

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Steven Lord 2024-3-2

These functions didn't exist when the question was originally asked (they were introduced in release R2018b) but the sinpi and cospi functions may be of use.

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Answer 1

KSSV 2016-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/303861-how-do-i-write-the-following-functions-on-matlab-x-t-2tcos-pi-t-y-t-2sin-pi-t#answer_235487

在 MATLAB Online 中打开

t = 0:0.1:60 ;
x = 2*t.*cos(pi*t) ;
y = 2*sin(pi*t) ;

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Khalid Tewfik 2016-9-21

this is what I have t = 0:.1:2; x1 = 2*t.*cos(pi*t); y1 = 2*sin(pi*t); plot(x1,y1) but i'm still getting the error message Error using * Inner matrix dimensions must agree.

Error in plotting (line 8) x1 = 2*t*cos(pi*t);

KSSV 2016-9-21

It should work.....you clear space and try..

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Answer 2

Adam 2016-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/303861-how-do-i-write-the-following-functions-on-matlab-x-t-2tcos-pi-t-y-t-2sin-pi-t#answer_235488

在 MATLAB Online 中打开

t = linspace( 0, 2*pi, 100 );
x = 2 * t .* cos( pi * t );
y = 2 * sin( pi * t );

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Khalid Tewfik 2016-9-21

this is what I have t = 0:.1:2; x1 = 2*t.*cos(pi*t); y1 = 2*sin(pi*t); plot(x1,y1) but i'm still getting the error message Error using * Inner matrix dimensions must agree.

Error in plotting (line 8) x1 = 2*t*cos(pi*t);