how to program to check the sequence 0<alpha1<alpha2<alpha3<alpha4<pi/2

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Mudasir Ahmed 2015-6-25

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评论： Mudasir Ahmed 2015-6-26

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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Answer 1

Stephen23 2015-6-25

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编辑：Stephen23 2015-6-25

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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

在 MATLAB Online 中打开

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