solve matlab equation( 512*512*lo​g2(B))/2>=​=520000

2014 4 2
2 个回答
更新时间：2014 4 2
4 次查看（30 天）

0 个投票

sir i am new to this matlab i want to satisfy the equation (512*512*log2(B))/>=520000 by keeping what value of B this equation will be satisfied answer is 16 .. i want how to do code for this equation in matlab by taking B values automatically to satisfy this equation

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回答（2 个）

A Jenkins
A Jenkins 2014-4-2

0 个投票

syms B
sym_b=solve(512*512*log2(B)/2==520000)
vpa(sym_b)
ans =
15.641263534925078400119749631703

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vaka sindhu
vaka sindhu 2014-4-2
sir i have to satisfy this equation by choosing which value of B will satisfy the equation
Walter Roberson
Walter Roberson 2014-4-2
编辑：Walter Roberson 2014-4-2
The answer is 15.641263534925078400119749631703 approximately, and "A Jenkins" shows one way it can be calculated.
vaka sindhu
vaka sindhu 2014-4-2
sir i am getting error like this ?? Error using ==> mupadmex Error in MuPAD command: cannot differentiate equation [numeric::fsolve]
Error in ==> sym.sym>sym.mupadmexnout at 2018 out = mupadmex(fcn,args{:});
Error in ==> solve at 76 [symvars,R] = mupadmexnout('symobj::solvefull',eqns,vars);
Error in ==> Untitled7 at 2 sym_b=solve('(512*512*log2(B))/2==520000'); can u say me how to solve asap
vaka sindhu
vaka sindhu 2014-4-2
sir i am getting can say me the code .....
A Jenkins
A Jenkins 2014-4-2
In older versions of MATLAB, you can try rearranging:
sym_b=solve((512*512*log2(B))/2-520000)

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Star Strider
Star Strider 2014-4-2

0 个投票

The easiest way is to take the base-2 antilog of both sides. You get the answer directly:
B = 2^(2*520000/(512^2))
gives:
B =
15.6413e+000

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A Jenkins
A Jenkins 2014-4-2
That was going to be my next proposal too, but then we are just teaching math, and not "code for this equation in matlab by taking B values automatically to satisfy this equation".

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