# solving for an unknown variable when given the rest

11 views (last 30 days)
laura webb on 25 Nov 2020
Commented: laura webb on 25 Nov 2020
i'm new to using matlab and i've been stuck on this for a while
i'm trying to calculate the value of V but i keep getting errors
syms V
y = 0.05;
k = 0.0806;
v = 90;
N = 4;
h = solve(y == 1/((1+k(V/v))^N),V)
Error using sym/subsindex (line 825)
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be
symbolic variables, and function body must be sym expression.
Error in untitled2 (line 8)
h = solve(y == 1/((1+k(V/v))^N),V)

Edited: Bastian Arturo Romero Mardones on 25 Nov 2020
syms V
y = 0.05;
k = 0.0806;
v = 90;
N = 4;
h = solve(y == 1/((1+k*(V/v))^N),V) %multiplication sign missing
you only should change
h = solve(y == 1/((1+k(V/v))^N),V) --> h = solve(y == 1/((1+k*(V/v))^N),V)
laura webb on 25 Nov 2020
thank you! can't believe i was so genuinely confused

R2018b

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