How do you plot a circle with a str2func()?

KG
2021 11 1
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更新时间：2021 11 1
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I was wanting to plot a circle using the str2func(). I'm able to plot the x section but the y section will not work. Thanks!
edit: I"m asking this for a friend, I'm trying to help him with a script that he's trying to write, but I"m not sure how to implement the str2func() to pick up the y values as well as the x values if a user inputs the x and y values.

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Matt J
Matt J 2021-11-1
Ran in:

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Ran in:
No idea why you think str2func should be part of the task. Why not simply,
fimplicit(@(x,y) x.^2+y.^2-100,11*[-1,+1,-1,+1]); axis equal

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Matt J
Matt J 2021-11-1
Perhaps you were aiming for something like this?
fun=str2func( '@(x,y) x.^2+y.^2-100' );
fimplicit(fun,11*[-1,+1,-1,+1]); axis equal
KG
KG 2021-11-1
I'm asking for a friend and he's trying to have someone input an equation into the command section using a function and then do a vertical line test to determine if the inputted equation is a function. He's wanting the user to input a string and then plot that string (by converting it using the str2func())and have his script determine if it passes the vertical line test. I think this may be what he is aiming for.
KG
KG 2021-11-1
I know it's confusing.
Walter Roberson
Walter Roberson 2021-11-1
S = input('Enter a function in x and y: ', 's');
fun = str2func( "@(x,y) " + S);

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KG
KG
2021-11-1

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