how to program to check the sequence 0<alpha1<alpha2<alpha3<alpha4<pi/2
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hi.
i have written a program in which 4 angles are derived (alpha1, alpha2, alpha3,alpha4). now i have to check whether they are in sequence or not. if not then i have to find again these angles. kindly help me how i program it to verify above condition. thanks in advance
Regards
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Stephen23
2015-6-25
编辑:Stephen23
2015-6-25
MATLAB supports binary relational operators only, so one cannot chain comparisons together as a<b<c, this needs to be written as a<b & b<c. You might want something like this:
val = 0<alpha1 && alpha1<alpha2 && alpha2<alpha3 && alpha3<alpha4 && alpha4<pi/2;
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Stephen23
2015-6-25
编辑:Stephen23
2015-6-25
I assume that the rows are supposed to be different, and not simply repeated like this? In any case, a true general solution would be to use diff, like this:
>> A = [0,15,30,45,60; 1,2,3,4,5; 0,45,90,135,180]
A =
0 15 30 45 60
1 2 3 4 5
0 45 90 135 180
>> all(0<diff(A,1,2),2)
ans =
1
1
1
Now change the last value of the second row:
>> A = [0,15,30,45,60; 1,2,3,4,1; 0,45,90,135,180]
A =
0 15 30 45 60
1 2 3 4 1
0 45 90 135 180
>> all(0<diff(A,1,2),2)
ans =
1
0
1
This is the most general solution in that it works for input matrices of any size.
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