Why am I getting "Array indices must be positive integers or logical values" when trying to add together all the integers?

Question

Penelope Akgun 2019-12-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495287-why-am-i-getting-array-indices-must-be-positive-integers-or-logical-values-when-trying-to-add-toge

关闭： MATLAB Answer Bot 2021-8-20

So here is the Data set:

Cost=[
58
61
64
69
73
78
82
88
94
02
09
18
29
39
50
63
78
93
11
31
52
76
01
30
61
97
36
78
26
79
36
00
71
49
36
32
37
54
83
25
66
27
33
82
55
76
25
71
81
36
82
75
85
16
31
41
14
17
31
01
97
38
23
47
01
96
10
71
68
20
07
35
63
39
67
91
33
58
34
16
02
74
59
58
70
96
35
88
54
34
27
34
54
88
35
96
70
58
59];
C=sum(Cost)

When I run it, I keep getting errors. I've used other commands to find the max or min and they come out just fine. Thank you

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Answer 1

Guillaume 2019-12-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495287-why-am-i-getting-array-indices-must-be-positive-integers-or-logical-values-when-trying-to-add-toge#answer_405220

Most likely you've created a variable called sum, so instead of summing the elements of Cost, you're using Cost as an index into the sum variable and of course as the error message tells you values like 55.58 are not valid indices.

Don't use sum, max, min, diff, etc. as variable names if you want to avoid this kind of problem.