how to make graph for this function

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Eva
Eva 2020-11-15
编辑： Setsuna Yuuki. 2020-11-15
f:y=Ix−4I+Ix2−5x+6I−Ix+4I+4.

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回答（1 个）

Setsuna Yuuki.
Setsuna Yuuki. 2020-11-15
编辑：Setsuna Yuuki. 2020-11-15
You can use fplot()
for example:
syms x;
y = @(x) abs(x-4)+abs(x^2-5*x+6)-abs(x+4)+4;
fplot(y,'LineWidth',3);
xlim([-6 12])
more info: https://es.mathworks.com/help/matlab/ref/fplot.html
  2 个评论
Eva
Eva 2020-11-15
Thank you very much but it says this: "Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input
arguments.
> In matlab.graphics.function.FunctionLine>getFunction
In matlab.graphics.function/FunctionLine/updateFunction
In matlab.graphics.function.FunctionLine.set.Function_I
In matlab.graphics.internal.figfile.FigFile/read (line 31)
In matlab.graphics.internal.figfile.FigFile
In loadFigure (line 31)
In openfig>localOpenFigure (line 75)
In openfig (line 40)
In open (line 132)
In uiopen (line 159)" How to fix it, please?
I need to make graph+asymptotes
Setsuna Yuuki.
Setsuna Yuuki. 2020-11-15
编辑：Setsuna Yuuki. 2020-11-15
Another way:
x = linspace(-6,12,2000);
y = abs(x-4)+abs(x.^2-5*x+6)-abs(x+4)+4;
plot(x,y,'LineWidth',2)

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