what am i doing wrong in this equation?

solve('sin(y+5)+5*sin(x)+5*cos(5*sqrt(x^2+y^2)+5*cos(x)+5*sin(5*sqrt(x^2+y^2)+5*cos(y)=z',z)))

i am having this error of parentthese and mismatche delimeters

[Jan]

Whenever you mention an error in the forum, post a copy of the complete message. The details matter.

You are providing an equation, where z is found on one side. Now you want to solve it for z? But this is done already.

Answer 1

[Jan]

From the doc of solve:

Support for character vector or string inputs has been removed. Instead, use syms to declare variables and replace inputs such as solve('2*x == 1','x') with solve(2*x == 1,x).

The closing parentheses of "cos(5*sqrt(x^2+y^2)" and "5*sin(5*sqrt(x^2+y^2)" have been moved behind the command. Insert spaces to improve the readability.

syms x y z
solve(sin(y+5) + 5*sin(x) + 5*cos(5*sqrt(x^2+y^2)) + ...
... %                                            ^ missing
... %                                 v missing             vv too many
      5*cos(x) + 5*sin(5*sqrt(x^2+y^2)) + 5*cos(y) == z, z)

ans = 

[Muhammad Mubashir Iqbal]

Dear i have already written this but same error

let me show you the complete

syms x y z

solve('sin(y+5)+5*sin(x)+5*cos(5*sqrt(x^2+y^2)+5*cos(x)+5*sin(5*sqrt(x^2+y^2)+5*cos(y),z')))

[Muhammad Mubashir Iqbal]

got it thanx alot

can you also guide how to check its result on a 3d plot using mesh or surf commands

[Jan]

Is it really useful to create this function symbolically? Why do you call solve to solve a function, which is the solution already? What do you want to achieve actually?

Answer 2

[Muhammad Mubashir Iqbal]

actually i am trying to see the result of this equation on a 3d plot

it is a equation of datum terrain function

syms x y z

[x, y, z]=meshgrid([0:0.2:4,0:0.2:4]);

solve(sin(y+5)+5*sin(x)+5*cos(5*sqrt(x^2+y^2))+5*sin(5*sqrt(x^2+y^2))+5*cos(y)==z,z);

figure(4)

surf(x,y,z)

i want to see the 3d plot

Error using ^ (line 28)

Arguments must be 2-D. Use POWER (.^) for elementwise power.

Answer 3

[Jan]

There is no need for symbolic calculations or the solve command:

[x, y] = meshgrid(0:0.2:4, 0:0.2:4);
z = sin(y + 5) + 5 * sin(x) + 5 * cos(5 * sqrt(x.^2 + y.^2)) + ...
    5 * sin(5 * sqrt(x.^2 + y.^2)) + 5 * cos(y);
surf(x,y,z)