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Graphing as a function of Y

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MC
MC 2019-9-23
评论： Ankit 2019-9-23
I want to use the function plot to plot the right-side of the equation f(y) = −2 + 5*y^2 − y*5 on the interval −2 ≤ y ≤ 2 (with y on horizontal axis).
The error message reads:
Error in assignment (line 1)
x = -2+5*y^2-y^5
How do I fix this?
x = -2+5*y^2-y^5
ylim([-2 -2])
plot (y,x)
  1 个评论
Bjorn Gustavsson
Bjorn Gustavsson 2019-9-23
If you have y as an array (either [n x 1] or [1 x n]) then matlab treats the operations * ^ as matrix-operations, for your case that means that y^2 and y^5 as matrix powers. You most likely want the element-wise power. In matlab that is written as y.^2 etc.
HTH

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回答（1 个）

rough93
rough93 2019-9-23
ylim([-2 -2])
x = -2+5.*y.^2-y.^5
plot (y,x)
As you are using a varying value of y in your x calculation, you need to include a . before your operations to make each calculation element-wise.
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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