Multiply values in array by *-1

2022 7 28
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Hi,
I have an array 1X106. I want to be able to multiply specific entries in the array by -1.
e.g., multiplying the 16, 17 and 18 value in the array by -1 whilst still keeping the remainder of the array with the original values.
Any help would be greatly appreciated,
Thanks!

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Chunru
Chunru 2022-7-28
Ran in:

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Ran in:
a = randn(1, 106);
a(14:20)
ans = 1×7
0.8401 1.6024 1.0470 -1.1157 0.2066 -2.0192 -0.6220
a(16:18)=-a(16:18);
a(14:20)
ans = 1×7
0.8401 1.6024 -1.0470 1.1157 -0.2066 -2.0192 -0.6220

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