How can I make matrix choose?

I had a function get me variable m like that

• m=[60;90;90;180;125.3;90;60;45;135]
• and I need N to change when m changes.

• When m=0 or 180 N=0
• When m=90 N=1

• when m=45 or 135 N=0.5
• Otherwise P =5.

• N and P are matrices not just value because it will be used in other equations.

[madhan ravi]

Upload your code

Answer 1

[madhan ravi]

>> m=[60;90;90;180;125.3;90;60;45;135]
N=zeros(1,numel(m)); % your N should be here instead of this
N(m==0 | m==180)=0;
N(m==90)=1;
N(m==45 | m==135)=0.5;
N = N'

m =

     60.0000
     90.0000
     90.0000
    180.0000
    125.3000
     90.0000
     60.0000
     45.0000
    135.0000

N =

           0
      1.0000
      1.0000
           0
           0
      1.0000
           0
      0.5000
      0.5000

>>

[madhan ravi]

What’s P?? Oh don’t need loop to do these operations

[Mahmoud Sami]

It's another function not related to N

[Mahmoud Sami]

P is a penalty function in GA optimization, so N=1 and P = 5

[madhan ravi]

The answer gives you all conditions for N

[Mahmoud Sami]

I would like to thank you for your help, but unfortunately some wrong outputs all 45 degrees get N=0, not 0.5.

[Mahmoud Sami]

Also, the other m value gets N=0, I don't know why?.

[madhan ravi]

Check the edited code I get N=0.5 when m = 45

[Mahmoud Sami]

The same problem, nothing new.

[madhan ravi]

you didn't provide the data for N so I gave zero values to N

[Mahmoud Sami]

Please explain, I can't understand your answer.

[madhan ravi]

can you post the datas of N ? Like you gave

m=[60;90;90;180;125.3;90;60;45;135]

what are the values of N?

[Mahmoud Sami]

My m in actual is 113*1. Here N is good in my code didn't get the answer.

[madhan ravi]

will you provide the real data of m and N this is the third time I'm asking? otherwise I can't help you if you don't cooperate

[Mahmoud Sami]

The code.

[madhan ravi]

explain with an example what you want to do (a simple one)

[Mahmoud Sami]

Like?

[Mahmoud Sami]

https://www.mathworks.com/matlabcentral/fileexchange/20025-dijkstra-s-minimum-cost-path-algorithm

[Mahmoud Sami]

Sorry my code depends on that code.

[madhan ravi]

phew.. I don't think I have enough time to debug your code by reading your mind

[Mahmoud Sami]

That's all data I have, other data is a mechanical data need more explain.

[Mahmoud Sami]

I'm just new with matlab, so the kind of ask and answer is not known for me. Sorry

[madhan ravi]

its ok it happens you will improve sooner :) , explain with steps what you are trying to achieve lets debug together

[Mahmoud Sami]

My master is to get optimization for cost in a piping design system. The cost of piping depends on piping weight. So the piping lenght,diameter and other components is the major items L, OD, N. So I need to know the shortest path, then optimize the diameter and calculate the cost. N is no of elbows in system the degree of elbows affects cost as it affect industry. So need to change the angle between segments to 90 or 45 and minimize no. Of elbows also. The penalty fcn for genetic algorithms is to put penalty to cost if ang is not 90 or 45. To make the optimization not choose it. That's in simple way.