Error in solve (Incorrect number or types of inputs or outputs for function 'solve'.)

My code is:

I am getting the error:

Error in untitled3 line 4

[x,y]=solve(ec1,ec2)

How to resolve the above error?

Answer 1

[Walter Roberson]

You did not mention your MATLAB release. Since roughly R2018b that form of solve() has not been available. These days you would need something closer to

syms x y
ec1 = y == x^2;
ec2 = y == log(x+1);
[x, y] = solve(ec1, ec2)

Warning: Unable to solve symbolically. Returning a numeric solution using vpasolve.

x = 

0

y = 

0

fimplicit([ec1, ec2], [-0.9 5])

[x, y] = vpasolve([ec1, ec2], 1)

x = 

0.74688174230852863531184994065236

y = 

0.55783233699382337329238431264145