How can i plot function from str2func ?

2017 3 19

1 个回答

8 次查看（30 天）

0 个投票

Sorry im a beginner, I use "str2func" to plot function, but this dont work. I got "Error using plot Invalid second data argument"

            x=0:0.1:3;  
            fstring='@(x)2.^x';
            fplot = str2func(fstring);   
            plot(app.UIAxes,x,fplot);

but this works :

            x=0:0.1:3;  
            f=2.^x;
            plot(app.UIAxes,x,f);

Why wont matlab plot first one ? And how do I solve it? Thanks

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Steven Lord 2017-3-19

1 个投票

You can't plot a function handle, but you can plot the data you receive from evaluating a function handle.

x = 0:0.1:2*pi;
fh = @sin;
plot(x, fh) % will not work
plot(x, fh(x)) % will work

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