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How to use "fzero" command with a variable(s)?
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format long;
lp_upper='besselj(1,x)/besselj(0,x)-besselk(1,sqrt(3.543149609311796^2-x^2))/besselk(0,sqrt(3.543149609311796^2-x^2))*sqrt(3.543149609311796^2-x^2)/x';
lpupperfrequency = fzero(lp_upper,2)
I am trying to figure out how to use a variable instead of a constant in the attached code above.
as an example, instead of using 3.543149609311796, I would like to use
lmn = 3.543149609311796;
format long;
lp_upper='besselj(1,x)/besselj(0,x)-besselk(1,sqrt(lmn^2-x^2))/besselk(0,sqrt(^2-x^2))*sqrt(lmn^2-x^2)/x';
lpupperfrequency = fzero(lp_upper,2)
when I tried that, it gives me an error.
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