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using syms x to create an equation Y(x), then letting x be a vector to plot, x vs Y

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Nicholas
Nicholas 2013-10-27
评论： Walter Roberson 2013-10-28
using syms x I have created an equation
Y = (x/20 - 2)*(x/40 - 1) - (x/20 - 1)^2 + x^2/800
I would now like to set x = to a vector say [0:0.1:40] and would like plot(x,Y)
how can i implement this because when i try plot(x,Y) i get an error of
EDU>> plot(x,Y) ??? Error using ==> plot Conversion to double from sym is not possible.

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Walter Roberson
Walter Roberson 2013-10-27
编辑：Walter Roberson 2013-10-27
xvals = 0:0.1:40;
plot(xvals, double(subs(Y, x, xvals)))
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Nicholas
Nicholas 2013-10-27
i tried it with other functions and it seems to work i dont know why my equation is linear but thank you
Walter Roberson
Walter Roberson 2013-10-28
That equation does evaluate to 1. Expand the first multiplication, expand the squared term, add the two together, then note that the x^2 term cancels with the remaining term in Y, leaving just 1.

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