Array indices must be positive integers or logical values.
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g=9.81;
m=95;
v=25;
t=10;
f(x)=m*g/x*(1-exp(-(x/m)*t));
Array indices must be positive integers or logical values.
I am taking this message. What is wrong at the code?
回答（1 个）
That notation only will work in the Symbolic Math Toolbox. Use Anonymous Functions to create functions for numeric calculations outside the Symbolic Math Toolbox.
Perhaps —
g=9.81;
m=95;
v=25;
t=10;
f = @(x) m*g./x.*(1-exp(-(x/m)*t));
xval = 10;
x = fzero(@(x)f(x)-xval,100)
xv = linspace(-1,150);
figure
plot(xv,f(xv), x, xval,'rs')
The function will not cross the x-axis. It is possible to determine where it will reach a specific value.
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2021-5-12
2021-5-12
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