Clear Filters
Clear Filters

Solving a formula in Matlab

3 views (last 30 days)
Hello everyone,
In the following formula : X= 2y + 10 log(1+ E/S)
I want the user to input X, y, and S. Is there anyway i can get matlab to give me the value of E without having to rewrite the formula?
Thank you so much!
Torsten on 6 Mar 2015
Maybe by using MATLAB's "solve" ?
Best wishes
Roger Stafford
Roger Stafford on 6 Mar 2015
It seems a shame not to use such a simple inverse formula as:
E = S*(exp((X-2*y)/10)-1);
assuming your log is the natural logarithm. Otherwise:
E = S*(10^((X-2*y)/10)-1);

Sign in to comment.

Accepted Answer

Giorgos Papakonstantinou
Giorgos Papakonstantinou on 6 Mar 2015
Edited: Giorgos Papakonstantinou on 6 Mar 2015
x = input('Enter the value of x: '); % request user input
y = input('Enter the value of y: ');
S = input('Enter the value of S: ');
f = @(E) 2.*y + 10*log(1+ E./S) - x; % create an anonymous function
[Eval, fval]= fsolve(f, 1); % solve your equation
or you can also:
syms E
f = 2.*y + 10*log(1+ E./S) == x;
solve(f, E)
If log refers to the base of 10 rewrite f by replacing log with log10.

More Answers (0)


Find more on Exponents and Logarithms in Help Center and File Exchange


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!