How can I send a value from GUI to constant block in Simulink Model?

I have threee constant block. And I want to value to those from GUI when ı pushed the button after ı take value from edit text blocks.

Answer 1

[Birdman]

As far as I know, edit text blocks takes input arguments as string. What you need to do is to use set_param command and convert the variables to double by using str2double command.

We have had a previous discussion about it, so please refer to that discussion. Here is an example:

set_param('gui/Constant','Value','i')
set_param('gui/Constant1','Value','j')

Do not forget to convert these values to double.

[bayram özmen]

yes ı did like that. but it gave me error like in figure. Parameters are sending well but value are not sending.

[Birdman]

set_param('byrm/Constant','Value','A1')
set_param('byrm/Constant1','Value','A2')
set_param('byrm/Constant2','Value','A3')

You need to properly define the path of the block in the first argument as I did. Please correct it for yourself. Also, the third arguments have to be the ones that you define in your GUI. Please make sure that they are the same. I wrote A1,A2 and A3 just for example. What are the parameters of edit text boxes in your GUI?

[bayram özmen]

my edit text boxes parameters are psi, theta and phi. But after I calculated some operations and then I want to send A2,A3,A4. For example; A2=psi+theta, A1= psi*3 like these.

[Birdman]

Do you define them like this? And please do not forget to convert them to double.

[bayram özmen]

if true
  % input1 = get(handles.edit1,'String');
input2 = get(handles.edit2,'String');
input3 = get(handles.edit3,'String');
psi=str2double(input1);
theta=str2double(input2);
phi=str2double(input3);
a=50;
s=125;

R=[cos(psi)*cos(theta),-sin(psi)*cos(phi)+cos(psi)*sin(theta)*sin(phi),sin(psi)*sin(phi)+cos(psi)*sin(theta)*cos(phi);sin(psi)*cos(theta),cos(psi)*cos(phi)+sin(psi)*sin(theta)*sin(phi),-cos(psi)*sin(phi)+sin(psi)*sin(theta)*cos(phi);-sin(theta),cos(theta)*sin(phi),cos(theta)*cos(phi)];

p=[-250,0,250;-250,250,-250;0,0,0];

T=[0,0,0;0,0,0;125,125,125];

b=[-200,-50,200;-250,250,-250;0,0,0];

l=T+(R*p)-b;

l1=sqrt((l(1,1)*l(1,1))+(l(2,1)*l(2,1))+(l(3,1)*l(3,1)));

l2=sqrt((l(1,2)*l(1,2))+(l(2,2)*l(2,2))+(l(3,2)*l(3,2)));

l3=sqrt((l(1,3)*l(1,3))+(l(2,3)*l(2,3))+(l(3,3)*l(3,3)));

L1=(l1.^2)-(s.^2-a.^2); L2=(l2.^2)-(s.^2-a.^2); L3=(l3.^2)-(s.^2-a.^2);

M1=2*a*(l(3,1)); M2=2*a*(l(3,2)); M3=2*a*(l(3,3));

N1=2*a*(cos(pi)*(l(1,1)+sin(pi)*l(2,1))); N2=2*a*(cos(0)*(l(1,2))+sin(0)*l(2,2)); N3=2*a*(cos(0)*(l(1,3))+sin(0)*l(2,3));

U1=M1^2+N1^2; U2=M2^2+N2^2; U3=M3^2+N3^2;

J1=N1/M1; J2=N2/M2; J3=N3/M3;

i=(asin(L1/sqrt(U1))-atan(J1))*57.32; j=(asin(L2/sqrt(U2))-atan(J2))*57.32; k=-1*(asin(L3/sqrt(U3))-atan(J3))*57.32; set_param('byrm/Constant','Value','i'); set_param('byrm/Constant1','Value','j'); set_param('byrm/Constant2','Value','k'); end

[Birdman]

It does not mean anything for me to see your code. Does it still give error?

[bayram özmen]

the constant block's names are true. But value of parameters are not sending. I did not understand why. Then error says undefined function or variable. Actually firstly ı run GUI. then I am openıng my sımulınk model after that ı run the simulink model.

[Birdman]

You should first open the model, then run the GUI.

[bayram özmen]

I think somethings is wrong. I am so sorry. I asked so many question. But when I pushed the button, ı want to see true values in displat that connect to constan blocks. But ı can not see.

[bayram özmen]

thank you. desired value are send to display and I saw true value.

[Birdman]

Okay that's good.

[KL]

this is not recommended...

@Birdman: yet you recommend it.

@bayram özmen: Please be warned about the risks associated with using assignin.