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how to plot these functions?

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thar
thar 2014-3-11
回答： Roger Stafford 2014-3-12
how to plot these functions in matlab 2013b?
  1. 49y^2-56x+16=0
  2. X^2+Y^2-(32/49)=0

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回答（2 个）

Walter Roberson
Walter Roberson 2014-3-11
Roger Stafford
Roger Stafford 2014-3-12
Successfully plotting such relationships often involves selecting the appropriate parameter. In the case of the first equation, that would be one of the variables, namely, y. If a range of y values is generated using 'linspace', then x is easily expressed as a function of y:
y = linspace(-5,5,1000);
x = (49*y.^2+16)/56;
This can then be plotted:
plot(x,y)
For the second equation, which is that of a circle, a good parameter to use is the angle of a vector from the origin to a point (X,Y) on the circle, which can be generated to vary between 0 and 2*pi. Then X and Y can be expressed in terms of that angle and the circle plotted.

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