solve symbolic function - I get non-simplified term

Hi,

I use syms X, Y, Z to solve for the jacobian of a matrix Xn and then plug in the values for X, Y, Z (1.5, 2.2, 8) but what I get is a non-simplified term: (719*29041^(1/2)*(1141^(1/2)/100 - 105/5629))/559 How can I programamtically calculate this term without going to command window copy and paste back to command window to get 69.951? My HW is due soon so I need your prompt response. Thank you very much for your help.

Answer 1

[Star Strider]

Use the vpa function:

    Q = vpa((719*29041^(1/2)*(1141^(1/2)/100 - 105/5629))/559, 5)

    Q =
    69.951

[Walter Roberson]

Or use double() if you want a floating point answer instead of a symbolic answer. If your expression contains variables then you will need to use vpa(); double() can only be used if everything can be calculated numerically.

[Mehdi]

I can't thank you enough sir.

[Star Strider]

My (our) pleasure!