Getting this error message? Subscript indices must either be real positive integers or logicals.? trying to solve monod equation ..!

clc; 
clear all; 
syms x t u I K s ks
u=0.05;
s=0.013;
ks=0.0003;
K=14;
I=45;
ki=1;
y=diff(x,t)==u*s*x*((I/(I+K)))/(ks+s+((s^2/(ki))))
cond=x(0)==0.1;
dsolve(y,cond)

Answer 1

[Walter Roberson]

You need to indicate that x is a function of t.

syms x(t) I K s ks
u=0.05;
s=0.013;
ks=0.0003;
K=14;
I=45;
ki=1;
y=diff(x,t)==u*s*x*((I/(I+K)))/(ks+s+((s^2/(ki))))
cond=x(0)==0.1;
dsolve(y,cond)

[Anirudh Mehta]

Thank you very much you made my day..!