23,082 reputation
13377
bio website
location
age
visits member for 2 years, 10 months
seen 5 hours ago

5h
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}]
7h
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}]
11h
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.
12h
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?
1d
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.
1d
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
1d
revised Make plots of solutions persist
added code
1d
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[....]]
1d
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.
1d
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?
1d
answered Make plots of solutions persist
1d
comment DateListLogLogPlot
btw, there is no DateListLogLogPlot function in M? screen shot !Mathematica graphics so not sure how you ended up with that.
1d
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?
1d
answered Symbolic versus numeric sum (is there an inconsistency?)
2d
revised Find the indexes of dependent columns
verfied OK.
2d
revised Find the indexes of dependent columns
verfied OK.
2d
revised Find the indexes of dependent columns
make it function
2d
comment Find the indexes of dependent columns
nice use of "AdjacencyLists", I had no idea such a thing exist.
2d
answered Find the indexes of dependent columns
Nov
20
comment timing series algorithm
I think you got the wrong group? May be you wanted math.stackexchange.com but you can try floor(T/delT)+1, where delT is timing between events. Assumed the same for all. Assuming event numbered 1, starts at t=0.