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Community Bot
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Dynamic doesn't work the way you think it does. See this answerthis answer for a full explanation.

In short, Dynamic doesn't do anything until it is actually displayed on screen.
Therefore, you are essentially doing this (note the String):

MapThread[f, {"Dynamic[ls]", {10, 20, 30}}]

As acl already showed, you can wrap the entire expression in Dynamic so that it does not attempt to evaluate the failing condition shown above.

Dynamic doesn't work the way you think it does. See this answer for a full explanation.

In short, Dynamic doesn't do anything until it is actually displayed on screen.
Therefore, you are essentially doing this (note the String):

MapThread[f, {"Dynamic[ls]", {10, 20, 30}}]

As acl already showed, you can wrap the entire expression in Dynamic so that it does not attempt to evaluate the failing condition shown above.

Dynamic doesn't work the way you think it does. See this answer for a full explanation.

In short, Dynamic doesn't do anything until it is actually displayed on screen.
Therefore, you are essentially doing this (note the String):

MapThread[f, {"Dynamic[ls]", {10, 20, 30}}]

As acl already showed, you can wrap the entire expression in Dynamic so that it does not attempt to evaluate the failing condition shown above.

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Mr.Wizard
Mr.Wizard
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Dynamic doesn't work the way you think it does. See this answer for a full explanation.

In short, Dynamic doesn't do anything until it is actually displayed on screen.
Therefore, you are essentially doing this (note the String):

MapThread[f, {"Dynamic[ls]", {10, 20, 30}}]

As acl already showed, you can wrap the entire expression in Dynamic so that it does not attempt to evaluate the failing condition shown above.