Now, I want to assign some values for a Table list and I find that
If
{mat[1], mat[2], mat[3], mat[4], mat[5]}={4,23,3,12,1};
it is no problem. But, if we use
Table[mat[n],{n,1,5}]={4,23,3,12,1};
It doesn't work. Why ? Thanks.
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$\begingroup$ This question has been asked several times before. Please help me in finding an appropriate duplicate and voting to close. $\endgroup$– Mr.WizardFeb 3, 2015 at 9:18
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$\begingroup$ Related: (280), (2033), (6511), (10322), (24495), (24557), (40094) $\endgroup$– Mr.WizardFeb 3, 2015 at 9:18
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2 Answers
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You should evaluate the left-hand side first.
Evaluate[Table[mat[n], {n, 5}]] = {4, 23, 3, 12, 1}
Another possible way:
With[{values = {4, 23, 3, 12, 1}},
Do[mat[n] = values[[n]], {n, 5}]]
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$\begingroup$ The first method will not work the second time. The second will, however. +1 $\endgroup$ Feb 3, 2015 at 9:19
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You must tell the kernel to evaluate the left hand side before invoking Set Try this:
Evaluate[Table[mat[n],{n,1,5}]]={4,23,3,12,1};
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$\begingroup$ Be aware that this will not work the second time. $\endgroup$ Feb 3, 2015 at 9:19
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$\begingroup$ Well then, do it right the first time around :-) $\endgroup$– Jason B.Feb 3, 2015 at 9:23