Matlab 2015a Script to solve the equation w=-tan(0.8*w)

To solve the equation symbolically or numerically, I wrote the following script (Matlab 2015a):

%-----------------------------------------------------------

syms w

EQ = w + tan (0.8 * w) == 0;

S = solve (EQ, w)

%-----------------------------------------------------------

But I don't get the expected result, that is w = 2.4482, rather I get :

Warning: Cannot solve symbolically. Returning a numeric approximation instead.

> In solve (line 305)

S =

0

Please, any help to fix the script

Answer 1

[Star Strider]

Use vpasolve with an initial value (or range of values as described in Specify Ranges of Solutions) —

syms w
EQ = w + tan (0.8 * w) == 0;
S = vpasolve (EQ, w, 2)

S = 

2.4482183943587910343011460497668

.

[T Hafid]

Thank you

[Star Strider]

My pleasure!

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