Mathematica

reading expressions in a file
Hi ; I have a file .txt generated from a software, each line of the file includes an expression and the last line is empty. How can Mathematica read lines of the text file and include each line in the same list without reading the last empty line . I used : MYLIST = ReadList["file.txt", Record, RecordSepar... 10 Mar 2010 07:28

3D graphing from text file?
Hello, I have a text file with the coordinates of a number of different points, and I would like to plot them using the ListPointPlot3D command. My text file is arranged like this: x1 *tab* y1 *tab* z1 *tab* x2 *tab* y2 *tab* z2 *tab* x3 etc, with nothing but tabs in between. Is it possible to have mathemati... 11 Mar 2010 06:43

Dynamically set variable name and value
Hi: I am have some trouble doing something I think should be relatively direct: Take two InputFields: in one place a variable name and in another place the value you want to set to that variable name. Have the value assigned to the variable name dynamically update. Any help? ... 11 Mar 2010 06:43

Title and subtitle on headers of every page in PDF export ?
Is this possible ? I typically use the subtitle for the name of the author (myself). In a multipage document, it would be useful to have this option. ... 10 Mar 2010 01:57

Mathematica function to calculate correlation
Thanks for your reply. But remember, the set of data values is 20 data points, and my computed distribution of n(t) is a function of t, so thousands and thousands of points. When I tried to use Correlation[data1, n(t)] I get the error "Correlation::vctmat: The arguments to Correlation are not a pair of vecto... 9 Mar 2010 06:43

Using NMinimize on a vector
Hello, I want to run this: `NMinimize[Distances[x, seq, z], x]` But x should be a vector whose dimensions will only be known at run time. How can I do this? I know I could put vectors into NMinimize, but how to do it when the dimension isn't known until runtime? Thanks, Ram. ... 10 Mar 2010 01:57

Why can't Mathematica tell when something is
hi, the concept of testing the algebraic equality/inequality of algebraic expressions is indeed one of the most complex issues to do (it is easy for you, because you already did it - and see it) but not easy from an algorthmic point of view! I would suggest 3 things: 1) try to find a normal form for the exp... 9 Mar 2010 06:43

PlotLegend interferes with Graphics
Hello everybody, I want to combine a Plot with a number of Graphics elements (encircled numbers) using Show[kinplot, kinlist] where kinplot is the Plot and kinlist is a list of Graphics elements. It works fine until I add a legend to my plot using PlotLegends: kinplot := Plot[{fx*xrt[t], fv*xrtd[t], fa*xr... 8 Mar 2010 07:28

union table
Dear Mathgroup, I need to join two table in which one column should be the same. And if it is not the same at the same position I would like to find the way that Math can match the column when for example the tenth column of the first table should be the same of the forth column of the second table. AI could do a... 10 Mar 2010 07:28

corrected Lighting example in Help
Hello mathGroup: While debugging some issue I had in my code concerning the Lighting specification, I corrected the follwing example in the Help for this option. It is an interesting example and since there were multiple syntax errors, I am posting it here for interested parties: In[1]:= $Version Out[1]= "7... 8 Mar 2010 06:23