I am creating a user interface and want to output a vector using the push button function

I am creating a user interface and want to output a vector using the push button function. i have written this code so far the push button but am getting error messages and not sure how to fix it.

the code ive used is:

theta = app.ThetaSlider;
 w_s= app.spinAVSpinner; 
 w_n = app.NutationAVSpinner;
 w_p = app.PrecessionAVSpinner;
  wi = [(-w_n*theta*0) 0 0];
  wj = [0 w_s*sind(theta) 0];
  wk = [ 0 0 (w_p + w_s*cosd(theta))];
  W = wi + wj + wk;
   app.WEditField.Value = W; 

The Result im trying to produce is: -3.0000 8.6603 10.0000

[Thomas Fournier]

Picture too blurry to see the error message

But the error may be that your edit field is excpecting a scalar and you are giving him a vector. You can either display it in 3 different edit field numeric, or display it as a string in a edit field (text).

[rahim njie]

ok thanks, how do i display it in one field and the error code is "unidentified function uminus"

[Thomas Fournier]

You can display vector in a edit fiel(text) by doing :

app.EditField.Value=num2str([4,2,5])

[rahim njie]

ok thanks however, when i run the code i keep getting error code referring to my use of 'sind' saying it is an undefined function. i need to use sind(theta) to output the correct results. Do you know how to solve this problem

Answer 1

[Dave B]

Your line of code

theta = app.ThetaSlider;

Says that theta should be the slider object. MATLAB is complaining because it doesn't know how to take the sine of a slider. I think you probably want to take the sine of the slider's value, which is as simple as

theta = app.ThetaSlider.Value;

[rahim njie]

thank you this was very helpful