Re: CForm Question
- To: mathgroup at smc.vnet.net
- Subject: [mg130154] Re: CForm Question
- From: Jak Alof <spamaddress.giveaway at yahoo.com>
- Date: Fri, 15 Mar 2013 01:46:50 -0400 (EDT)
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On Saturday, March 9, 2013 10:47:13 PM UTC-7, Jak Alof wrote:
> Hi,
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> I have a fairly complicated expression that involves arrays; I want to export the expression.
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> First, I generate 3 lists; entries in the list represent entries in a C Array.
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> X = Table[x[i], {i, 0, 7}];
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> Y = Table[y[i], {i, 0, 7}];
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> Z = Table[z[i], {i, 0, 7}];
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> Here is what X looks like:
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> {x[0], x[1], x[2], x[3], x[4], x[5], x[6], x[7]}
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> Then I do some other work using X, Y, Z and form expressions that I need in C. Here is a typical result that I need to export to C:
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> 1/12 (-y[4] z[1] - y[5] z[1] + y[2] (z[1] - z[3]) + y[4] z[3] +
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> y[7] z[3] + y[5] z[4] - y[7] z[4] - y[4] z[5] +
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> y[1] (-z[2] - z[3] + z[4] + z[5]) +
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> y[3] (z[1] + z[2] - z[4] - z[7]) + y[4] z[7])
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> The above expression involves values from the X,Y,Z tables created above which is exactly what I want. However, when I use CForm on this expression I get:
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> (-(y(4)*z(1)) - y(5)*z(1) + y(2)*(z(1) - z(3)) +
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> y(4)*z(3) + y(7)*z(3) + y(5)*z(4) - y(7)*z(4) -
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> y(4)*z(5) + y(1)*(-z(2) - z(3) + z(4) + z(5)) +
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> y(3)*(z(1) + z(2) - z(4) - z(7)) + y(4)*z(7))/12.
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> This is extremely close to what I want except that the array values are using 'parentheses' rather than the C square brackets. I understand that this stems from my original creation of the Tables X, Y,Z but I don't know how to get around that.
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> Is there a good way to fix this?
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> Thanks,
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> Jak
Thanks. That's helpful.