Minimum Block from Simulink

Hi there,

If I had the following vector:

[2.34 50.3 21.9 1.75 22.8 50.1]

and want to find the minimum value with its index, how can I built it in Simulink please? for the vector above the minimum value is 1.75 and the index is 4.

However, I've tried Minimum block but it seems that it does not meet my requirement. Could you please help with this.

Many thanks, Nadia

[Azzi Abdelmalek]

In simulink, what the vector [2.34 50.3 21.9 1.75 22.8 50.1] is representing?

[Nadia]

Hi Azzi, thanks for your reply.

Actually, this vector is imported from MATLAB and it represents the input signal of my model design.

[Azzi Abdelmalek]

What block are you using to import this vector, constant block or from workspace block, or from file?

[Nadia]

from workspace block

[Azzi Abdelmalek]

Post the setting of your from workspace block

[Nadia]

sample time: 1

Interpolate data is active high Form output after data value by : Extrapolation

Answer 1

[Azzi Abdelmalek]

If your vector comes from a constant block, for example, you can use matlab function block where you will put a code below:

function [min_value,index]=fcn(v)
[min_value,index]=min(v)

%

[Azzi Abdelmalek]

Notice that I've added 1 to your vector, it correspond to a time stamp

[Nadia]

much appreciated your help. just a question please, if the vector had some negative number does this design work?

[Azzi Abdelmalek]

Yes it should work.

[Nadia]

If I had a 4 vectors each has one number, like v1= 25.4 ; v2= 56.3 ; v3=60.3 ; v4=12.55 ;

How do I find the min and its index in this case?

[Nadia]

For the Matlab function you've posted above, Could vector v be many vectors? I mean the input of the Matlab function is many inputs rather than just one?

[Azzi Abdelmalek]

What do you mean? That if v can change every step time, yes but you should change your input source

[Nadia]

Yes, if v is changing every step time.

Do I need to change the input source manually?

[Azzi Abdelmalek]

No, If you want for example the sequences

     2     3     4  at 0s
     5     6     7  at 1s
     8     9    10  at 2s
     2     3     9  at 3s

Then in from workspace block set data to x with

x=[0 2 3 4
   1 5 6 7
   2 8 9 10
   3 2 3 9]

In this case, the sample time should be 1s and stop time 3s

[Nadia]

have you tried that in Simulink please?