convert milliseconds (ms) to seconds (s)

Question

looking for answers 2019-7-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473594-convert-milliseconds-ms-to-seconds-s

评论： looking for answers 2019-7-28

采纳的回答： Stephen23

在 MATLAB Online 中打开

Hello,

we have an array with stimuli onset times in milliseconds,

ms = [1600901 1970185 2340488 2710467 3080481 3449869]

and we want to convert those values to seconds with a specific format, that would be, 1600901/1000 = 1600.901.

But when I do that in MATLAB I get this result:

s = ms/1000
s = 
   1.0e+03 *
    1.6009    1.9702    2.3405    2.7105    3.0805    3.4499

Is there a way to obtain this insead:

s = [1600.901 1970.185 2340.488 2710.467 3080.481 3449.869]

Thank you

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Answer 1

Stephen23 2019-7-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473594-convert-milliseconds-ms-to-seconds-s#answer_384937

编辑：Stephen23 2019-7-26

在 MATLAB Online 中打开

You can change the format of how numbers are displayed, e.g. "shortG"

>> format shortG
>> ms/1000
ans =
       1600.9       1970.2       2340.5       2710.5       3080.5       3449.9

Or "longG":

>> format longG
>> ms/1000
ans =
                  1600.901                  1970.185                  2340.488                  2710.467                  3080.481                  3449.869

The default is "short":

>> format short
>> ms/1000
ans =
   1.0e+03 *
    1.6009    1.9702    2.3405    2.7105    3.0805    3.4499

Note that none of these make any difference to the numeric values stored in your array. Do not confuse how numbers are displayed with what values are stored in a variable. These are two quite different things.

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Guillaume 2019-7-26

You are indeed confusing the ways the number are stored and display.

Matlab store 1600.901 neither as 1600.901 or 1e3 * 1.6009. The way it is stored is actually irrelevant but it is stored as a binary fraction (1.1001000000111001101010011111101111100111011011001001b * 2 ^ 10, resolving to ~= 1.5633798828125 * 2^10) and there's nothing you can change about that. The actual decimal value stored in memory is 1600.9010000000000673026079312.

You are asking to change the way matlab displays the number to you, and for that you should use format shortg or format longg as answered by Stephen.

looking for answers 2019-7-28