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Nov
23
comment Why is my output equal to my input?
fyi, Maple 18 gives this answer, I'll leave you to decide how useful this result is !Mathematica graphics
Nov
23
comment Can anyone help me to get the solution of this first order ODE?
You can always try DSolve since it can actually solve it analytically . screen shot !Mathematica graphics eq = y'[x] == -Sqrt[y[x]^3]; ic = y[0] == -2; sol = y[x] /. First@DSolve[{eq, ic}, y[x], x]; Plot[Re[sol], {x, 0, 1}]
Nov
23
comment Can anyone help me to get the solution of this first order ODE?
it seems a typo in the pdf. The ODE is there few lines above it. it is NDSolve[{y'[x]^2-y[x]^3==0,y[0]^2==4},y,{x,1}]
Nov
23
comment Mathematica List Selection
@SquareOne you are smarter than me and seemed to have figured what OP wants. Can you write it in terms of symbols using p1,p2,p3,p4 that he showed? Does OP wants abs[p1-p2]>600 ? I do not understand how the solution shown came about, and I am drinking lots of coffee now and still do not get it.
Nov
23
comment Mathematica List Selection
I do not understand how you came up with the answer. So, why not this one {{206.314, 4135.81}, {95.84, 0.}} for example? Maybe you can explain using point1,point2,point3,point4 it will be better. Are you looking for Abs[point2-point1]>600 for example?
Nov
22
comment DateListLogLogPlot
The above must have been what happened as there is no other way to explain it. May be symbols in other than System` context can be show in one color and everything else in another color! Or, add a small horizontal line between System names (shown first) then all symbols in other contexts below the line next. I think mixing System symbols with user defined symbols is not a good idea in the the command completion popup menu as it is the case now.
Nov
21
comment DateListLogLogPlot
though the Command completion feature finds it. on my system, as I show in the screen shot above, DateListLogLogPlot does not show up. Version 10.01 on windows, if it shows up on your system, this is a bug that should be reported to support@wolfram.com
Nov
21
revised Make plots of solutions persist
added code
Nov
21
comment How to tell Mathematica that certain variables are real/imaginary, integer-valued, etc
But I want to tell Mathematica that some of the parameters are real (ie L) and some are integer valued you can us e ComplexExpand it says expands expr assuming that all variables are real, for integers, you can use Assuming[Element[x,Integers],Simplify[....]]
Nov
21
comment Make plots of solutions persist
@Stephen Ok, I understand now. Yes, you can, you'd need to save all the plots done earlier. You'd need also a button to clear all. I'll add something to do this, but busy at this moment.
Nov
21
comment Make plots of solutions persist
What about my stated question? Can LocatorAutoCreate be used to save new locator points sorry, do not see this question here? as I mentioned, it is best to have one specific question for one issue, makes it easier to answer. You can make new question specific for the new issue?
Nov
21
answered Make plots of solutions persist
Nov
21
comment DateListLogLogPlot
btw, there is no DateListLogLogPlot function in M? screen shot !Mathematica graphics so not sure how you ended up with that.
Nov
21
comment DateListLogLogPlot
I just tried it again on V 10.01 and it works: !Mathematica graphics (at first I thought you did not the correct API). Can you try again after starting new kernel?
Nov
21
answered Symbolic versus numeric sum (is there an inconsistency?)
Nov
21
revised Find the indexes of dependent columns
verfied OK.
Nov
21
revised Find the indexes of dependent columns
verfied OK.
Nov
21
revised Find the indexes of dependent columns
make it function
Nov
21
comment Find the indexes of dependent columns
nice use of "AdjacencyLists", I had no idea such a thing exist.
Nov
21
answered Find the indexes of dependent columns