value that increase along with changing value by manual switch block simulink using embedded matlab function

hi all

i just wanna ask,how we do the increasing value by changing manual switch in simulink??

for example: i have manual switch, with 2 constant block connect to it, first signal= 1 , second=0. i have calculation that everytime we change value in manual switch the system will add 10 to the current signal.

how we do it with embedded matlab function??

[Walter Roberson]

Duplicate is http://www.mathworks.com/matlabcentral/answers/11705-value-that-increase-along-with-changing-value-in-manual-switch-block-simulink

Answer 1

[Fangjun Jiang]

Do you have to use EML? If not, it could be done easily in Simulink using a trigger subsystem. Type "sldemo_counters" to open the demo model, connect your manual switch block output to the triggered subsystem. Inside the system, change the trigger from "risgin" to "either", change the constant from 1 to 10 then you got it.

[Luhur]

Oh my GOD!!! you always help me fang, BIG THANKS TO YOU...

Answer 2

[Walter Roberson]

Please do not open duplicate questions; it just ends up duplicating efforts.

You can edit your previous question if needed.

[Luhur]

thanks for warn me walter.. :)

Answer 3

[Kaustubha Govind]

FWIW, here's an EML implementation:

function y = mycounter(u)
%#eml
  persistent count;
  persistent prevInput;
  firstInput = false;

    if isempty(count)
       count = 0;
    end
    if isempty(prevInput)
       prevInput = 0;
       firstInput = true;
    end

    if ~firstInput
     if (prevInput ~= u)
      count=count+1;
     end
    end

    prevInput = u;
    y = count;
end

[Luhur]

what is FWIW stand for govind??

ANYWAY, THANKS!!! :)

[Walter Roberson]

FWIW means "For What It Is Worth".

Answer 4

[Fangjun Jiang]

Okay, feed the switch output signal to the triggered subsystem, still choose "either". Also, feed the switch output signal to an Inport of the the triggered subsystem, multiple it by 10, then feed it to an Integrator block. Did not verify. Should work. Try it yourself.

[Luhur]

error fang, it was:

'untitled1/Triggered Subsystem/Integrator' has a continuous sample time. Only constant (inf) or inherited (-1) sample times are allowed in triggered subsystem 'untitled1/Triggered Subsystem'.

anyway, im using slider gain with value -1,0,1

[Fangjun Jiang]

Then change the sample time of the Integrator block to be -1.

[Luhur]

not integrator fang, but unit delay.. thanks fang!! :)

Answer 5

[Luhur]

what if i have 3 signal fang??? -1,0,1 ,, if -1 then the current value was be diminished, 0 the value stay still and 1 the value increase.

[Fangjun Jiang]

It certainly can be done. It is different though. Your original intention was to increase the counter by 10 every rising or falling edge of your switch output. This one, how do you increase if the switch output is 1? Increase 10 at every time step? Or there is something else trigger the increase?

[Luhur]

nope, only 1 trigger, if 1 then current value add by 10, if 0 then current value stay still, if -1 then current value minus by 10.

how is it fang???

[Fangjun Jiang]

If 1 then current value is increased by 10. Increased only once, or every time step as long as the switch output is 1?

[Luhur]

no only once, the case was the same with the manual switch, but in this case there was 0 and -1 for minus it.

so when curent value is 10, then the signal give 1, then 10 + 10 = 20,, and then the signal gives 0, then 20 + 0 = 20,, and if the signal gives -1, then 20 - 10 = 10,,

so now, the current value is 10.

how is it fang???