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2012-06-25 10:29:45 +0200	commented answer	autodeclare variables Awesome, thanks!!
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2012-06-25 10:29:38 +0200	marked best answer	autodeclare variables You can use `symbolic_expression`, which will automatically detect variables. For example, `sage: symbolic_expression('3 * y') 3y` If you need the variables in the global namespace, you can use `map(var, symbolic_expression('3 y').variables())`
2012-06-25 09:32:23 +0200	answered a question	How to install sage5 in OpenSuSE 11.4 Awesome, thank you!
2012-05-24 10:02:24 +0200	asked a question	How to install sage5 in OpenSuSE 11.4 Are there any packages?
2011-10-10 12:54:21 +0200	commented answer	autodeclare variables That's nice! Thank you!
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2011-10-10 08:02:21 +0200	commented answer	collect multiple variables and simplify their coefficients Okay, thank you! It seems I have to do it manually then.
2011-10-10 07:15:04 +0200	commented answer	autodeclare variables Unfortunately this doesn't work in the command line interface or in a standalone python program. Is there a similar command?
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2011-10-09 16:50:44 +0200	asked a question	collect multiple variables and simplify their coefficients Hi there! In Mathematica you can do the following: Collect[expr, {var1, var2, var3}, Simplify] This transforms expr = var1expr11 + var2expr22 + var1var2expr12 + ... to var1Simplify[expr11] + var2Simplify[expr22] + var1var2Simplify[expr12] + ... I was wondering if there is an easy way to do this in Sage. So my questions are: 1) How can you collect multiple variables? 2) How can you manipulate their coefficients? (each coefficient is independent) 3*) How can you print the result in a pretty way? (e.g. collecting the expression by coefficients and printing each term in a new line) Thanks for your help!
2011-10-09 15:30:30 +0200	commented answer	autodeclare variables Ah you're right. That's strange, a simple expression worked, but sin(x) not. I'll check it out. Thank you very much for your help!
2011-10-09 14:39:55 +0200	commented answer	autodeclare variables I'm afraid Maxima cannot handle my expression. I tried your workaround, but it fails on my expression (it has for example sin(x). Anyhow want to make it as general as possible).
2011-10-09 13:42:33 +0200	answered a question	autodeclare variables Thank you for your answer. I import it from the rather unknown program "FORM" from Jos Vermaseren (I think it is only popular among theoretical particle physicists). I'm not sure if FORM can export its declarations.
2011-10-09 13:02:41 +0200	asked a question	autodeclare variables Hello Everyone! Is there a way to autodeclare variables? For example: I want to import an expression from another computer program. Now this expression is stored as a string, that means I have to evaluate it in sage. sage_eval(expression) It works fine, but if the expression contains variables, these have to be manually declared first as var('variables'). I want to do this automatically, e.g.: sage_eval(expression, autodeclarevariables=on) Is there a way to do something like that?