how to plot a function handle on matlab 7 ?

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HeadingUpHigh
HeadingUpHigh 2018-4-20
评论： Star Strider 2018-4-21
my code is i'm asking the user to input a funtion and i transform it to a handle one (note that i'm using the matlab 7.0 R14) :
funstr = input('• Please enter your function here : ', 's');
f = eval( ['@(x) ' funstr ] );
how can i possibly do the plot of this between the two points a and b? i keep getting errors
??? Index exceeds matrix dimensions
or
??? Error using ==> plot Conversion to double from function_handle is not possible.
i tried it with plot and fplot and none of them is working !
thanks for helping in advance.

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Star Strider
Star Strider 2018-4-20

You need to evaluate the function in the plot call.

Example —

fun = @(x) x.^3 - 8*x.^2 + 10;
x = linspace(-5, 5);

figure
plot(x, fun(x))
grid
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Star Strider
Star Strider 2018-4-21
As always, my pleasure.
The File Exchange has several functions that add necessary capabilities missing in earlier MATLAB versions. (Many of these have been incorporated in MATLAB and the Toolboxes since.)

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