Error using exponents in a small mathematical equation

It seems I've run into a problem with a mathematical equation A=(-3.5*a)^3+(exp^7)/ln(524*a)+206^1/3 gives Error using exp Not enough input arguments.

Answer 1

[Andrei Bobrov]

exp^7 -> exp(7) and ln(524*a) -> log(524*a)

A = (-3.5*a)^3 + exp(7)/log(524*a) + 206^1/3 ;

[Anass Banbouk]

Thanks, it seems another problem popped up after fixing exp >Undefined function or variable 'ln'.

[Guillaume]

Please, use the documentation. The natural logarithm function in matlab is called log (and 10 based logarithm is log10)

[Andrei Bobrov]

Oh! My mistake! Fixed.

[Anass Banbouk]

Apologies.

[Anass Banbouk]

Why does the equation >2.9^c(16+41*c/29)/1.7^5+11*c+nthroot(4,23*c) give Subscript indices must either be real positive integers or logicals.

[Stephen23]

You are getting the error because you have used implicit multiplication, but MATLAB interprets this as indexing. The syntax you use here is for indexing into c, not for multiplication with some other value:

 2.9^c(16+...

If you want to multiply these values, then you need to specify this:

 2.9^c * (16+...
       ^