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Help in writing a a code for an array based on comdition.

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I have an array A. A1= [-0.0082 -0.0409 -0.0175 -0.0853 0.0217 -0.2556 -0.0302 0 ]
From A array I want to replace negative numbers with -1, positive numbers with 1 and zero will remain zero . Like this :
A= [-1 -1 -1 -1 1 -1 -1 0]
Then I want to take there sum and if there sum is smaller than threshold then value will be set to zero. If equals and greater than threshold than value will be 1. Threshold is 12.
How to write code for this?

Accepted Answer

Torsten
Torsten on 17 Mar 2023
A1 = [-0.0082 -0.0409 -0.0175 -0.0853 0.0217 -0.2556 -0.0302]
A1 = 1×7
-0.0082 -0.0409 -0.0175 -0.0853 0.0217 -0.2556 -0.0302
A = -(A1<0) + (A1>0)
A = 1×7
-1 -1 -1 -1 1 -1 -1
s = sum(A)
s = -5
threshold = 12;
value = double(s >= threshold)
value = 0
  4 Comments
Haya Ali
Haya Ali on 17 Mar 2023
Edited: Haya Ali on 17 Mar 2023
It is taking 0 as a positive number and -0 as a negative number. Please help
Columns 1 through 13
0.0000 -0.0000 3.2115 2.7009 -0.0000 -0.0000 0.0000 0.1799 0.9524 -0.0000 -0.0000 0.1566 0.0000
Columns 14 through 25
-0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 -0.0000
A =
Columns 1 through 21
1 -1 1 1 -1 -1 1 1 1 -1 -1 1 1 -1 -1 -1 -1 -1 1 -1 1
Columns 22 through 25
-1 1 -1 -1
Walter Roberson
Walter Roberson on 17 Mar 2023
0 and -0 display as 0 not as 0.0000 or -0.0000. So your values are not 0 and -0
Give the command
format long g
and then display your values again

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More Answers (1)

Walter Roberson
Walter Roberson on 17 Mar 2023
See sum sign
However, your description does not match your example. You say you want to replace positive numbers with 1, but your example shows replacing the only positive number with 0.

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