use of vairibles with solve

hi, im fairly inexperienced in matlab so any help would be useful here basically i ave simple bit of code and i need to solve an equation for x where in the equation another preassigned variable is used

solve ('cos(x/b) + sin(x/b) - 0.7==x')

here 'b' should be a constant that's already been assigned earlier

also i'm having trouble getting answers from 'solve' to be stored in a variable. any help would be greatly appreciated.

Answer 1

[David Sanchez]

The following code should not give you any trouble:

syms x
b = 3;   % use your own value here
my_answer = solve (cos(x/b) + sin(x/b) - 0.7==x);

It yields:

my_answer =

0.43360539229972390998442935562107

[Walter Roberson]

Note: this syntax will not work until about R2011b (I think it was). For earlier versions, change the "==x" to "-x"

[robert perry]

i'm using R2013a so that's brilliant thanks, it was the ' syms x ' i was missingto make it work