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I am solving a system of 15 simultaneous linear equations using Solve. On running the code, I get a message saying "A very large output was generated" with options for viewing the ouput. I want to use the solution inside a larger program where the next step relies on the ouput of Solve. I am stuck unless there is a reasonable way for me to capture the output from Solve. Is there a way to do this?

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    $\begingroup$ You don't need to display the output; if you do sol = Solve[...]; you'll suppress the output (with ;) but everything will be assigned to sol. $\endgroup$
    – b.gates.you.know.what
    Jan 4, 2013 at 22:05
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    $\begingroup$ If you have not already done so, set Cubics->False and Quartics->False and see if that improves matters. $\endgroup$
    – Daniel Lichtblau
    Jan 4, 2013 at 22:05
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    $\begingroup$ Because these are linear equations, why aren't you using LinearSolve? $\endgroup$
    – whuber
    Jan 5, 2013 at 18:03

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Is something like this useful?

s1 = Solve[Table[RandomInteger[100, {15}]. Array[x, 15] == y@i, {i, 15}], Array[y, 15]];
y[1] /. s1[[1]]
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Thanks for the suggestions. I first put the set of equations as a SparseArray using CoefficientArrays function. Then solved using LinearSolve.

{b,m}=CoefficientArrays[Set of Equations, {Variable List}];
LinearSolve[m,-b]

See the tutorial "Solving Linear Systems" (I have version 8)

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  • $\begingroup$ Ah, I missed "linear". That being the case you might also want to experiment with options Method->OneStepRowReduction or DivisionFreeRowReduction. $\endgroup$
    – Daniel Lichtblau
    Jan 10, 2013 at 23:01

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