Compare arrays in Simulink

I have two arrays which I would like to compare with each other.

eg. A = [4.1,5.2,7.1] B = [1,2,3,4,5,6,7,8]

I want to be able to say that the following match 4.1->4, 5.2->5, 7.1->7 and then show it in a different array like C = [0,0,0,1,1,1,0]

I have been trying to use For loops but havent managed to solve it as yet. Any suggestions would be useful

*edit

I cannot use a Matlab function block as I need to use it with TargetLink later.

Thanks, Dhruv

[Friedrich]

What with a value of 5.8? Is this then equal to 6 or still to 5? Basically what kind of rounding do you apply?

[Dhruv]

I actually need to be able to provide the range for the categorizing myself as they keep changing. I dont need something to round the values.

eg.  A = [4.1,5.2,7.1]

Here,

*edit

0.0 < A <= 2.3 --- 1

2.3 < A <= 2.5 --- 2

2.5 < A <= 4.2 --- 3

4.2 < A <= 5.4 --- 4

5.4 < A <= 8.0 --- 5

[Azzi Abdelmalek]

This is not clear? what is 0-2.3 ?

[Friedrich]

I guess thats the range. Values between 0 and 2.3 are mapped to 1 and so. However its not clear what hapens with values equal to 2.3. Are those values mapped to 1 or 2?

[Dhruv]

I have edited my comment to remove the confusion

Answer 1

[Azzi Abdelmalek]

A = [4.1,5.2,7.1];
B = [1,2,3,45,6,7,8];
out=zeros(size(B));
out(fix(A))=1

[Dhruv]

I need to do this in Simulink without using any Matlab function blocks.

[Azzi Abdelmalek]

You have to explain, What are A and B? from constant blocks, or from what?

[Dhruv]

the arrays can be assumed to be from Constant blocks

PS. I have made a comment to the question to explain it better

[Kaustubha Govind]

Dhruv: This kind of problem seems more suited to MATLAB than Simulink - is there a reason you are opposed to using the MATLAB Function block? Note that you CAN generate C/C++ code from this block.

[Friedrich]

@Kaustubha: AFAIK Dhruv is using TargetLink later which does not support the MATLAB Function block for code generation.

[Azzi Abdelmalek]

The simulink coder support the Matlab function block. some matlab function are not supported, but there is a way to do it without those functions.

[Friedrich]

Yes, SL Coder can handle MATLAB function blocks, but not TargetLink ;)

AFAIK TargetLink has its own block called "Custom Code block" which uses selfwritten C file. I guess implementing this in C is a way easier and faster (not in executing it, but faster in implementing that logic) than doing it in Simulink. Would that be an option for you?

In that way you could also write MATLAB code for that task, use the MATLAB Coder to generate C code from the MATLAB code and then use that C code in the custom code block.

[Dhruv]

Yes, I am actually working with something similar to TargetLink called Intecrio. Sadly, I dont even have have a 'Custom Code Block' available to me.

Bottomline, I need to do this using Simulink. Any help is appreciated.

[Friedrich]

Is a Look-Up-Table supported? If so, this would be what you need together with a For Itterator Subystem.

[Dhruv]

I have the possibility of using a Matlab embedded block inside a Stateflow chart.. though I have never used Stateflow.. could you think of it as a possibility to be used in such a case?

Answer 2

[Chetan Aswathanarayana]

Does this work ?

http://imageshack.us/photo/my-images/706/w1fv.png/

http://imageshack.us/photo/my-images/560/c1ze.png/

[Chetan Aswathanarayana]

https://www.dropbox.com/s/9iqv09tuw061vzj/Array_Compare.zip