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How to plot the function f(x)=x^3 - 4x^2 +1 for x∈[0,25]

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Potatopao
Potatopao 2015-4-14
编辑： pfb 2015-4-14
x= 0:0.01:25. For y=x^3 - 4x^2 +1 your plot command will be variant of plot(x,y).

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pfb
pfb 2015-4-14
You almost got it. Since x is a vector, you should use elementwise operators. not x^2 (what's the square of a vector?) but x.^2.
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pfb
pfb 2015-4-14
编辑：pfb 2015-4-14
also, you should write the multiplication operator (*) explicitly
x= 0:0.01:25
y=x.^3 - 4*x.^2 +1;
plot(x,y);

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