Asterisk appearing during row operation

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Ikenna Iwudike
Ikenna Iwudike 2022-10-22
评论： Steven Lord 2022-10-22
Ran in:
When I'm doing row operations on matlab, and i'm trying to make a number zero, an asterisk appears. I dont know why this is.
format rat
B = [-6 8 -9 4 ;4 -3 5 7 ;-9 7 -8 -8 ;4 -3 3 3 ]
B =
-6 8 -9 4 4 -3 5 7 -9 7 -8 -8 4 -3 3 3
B(1,:) = B(1,:)/-6
B =
1 -4/3 3/2 -2/3 4 -3 5 7 -9 7 -8 -8 4 -3 3 3
B(2,:) = B(1,:)*-4 + B(2,:)
B =
1 -4/3 3/2 -2/3 0 7/3 -1 29/3 -9 7 -8 -8 4 -3 3 3
B(3,:) = B(1,:)*9 + B(3,:)
B =
1 -4/3 3/2 -2/3 0 7/3 -1 29/3 0 -5 11/2 -14 4 -3 3 3
B(4,:) = B(1,:)*-4 + B(4,:)
B =
1 -4/3 3/2 -2/3 0 7/3 -1 29/3 0 -5 11/2 -14 0 7/3 -3 17/3
B(2,:) = B(2,:)*(3/7)
B =
1 -4/3 3/2 -2/3 0 1 -3/7 29/7 0 -5 11/2 -14 0 7/3 -3 17/3
B(1,:) = B(2,:)*(4/3) + B(1,:)
B =
1 * 13/14 34/7 0 1 -3/7 29/7 0 -5 11/2 -14 0 7/3 -3 17/3

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Matt J
Matt J 2022-10-22
编辑：Matt J 2022-10-22
Ran in:
Presumably, it's just a display choice to keep things readable. The number there does exist, but they don't want to give you the mistaken impression that it is exactly zero:
B(1,:)
ans =
1 * 13/14 34/7
B(1,2)
ans =
-1/4503599627370496
  1 个评论
Steven Lord
Steven Lord 2022-10-22
Matt J is correct. From the documentation for the rats function (which uses the same algorithm as format rat): "Asterisks indicate elements that cannot be printed in the allotted space, but which are not negligible compared to the other elements in X."

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