# All Questions

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### Copy TraditionalForm output to TraditionalForm input while keeping formatting

When I want to copy a scientific notated number from a TraditionalForm output to an input it formats it in a weird way: Another thing I want to do is only copy a few number of decimals, and remove ...
2answers
425 views

### Internal “Periodical” functions in version 7

In version 7 there exist these Internal context functions: ?Internal*Periodical* AddPeriodical   ...
1answer
722 views

### NDSolve does not give me the expected solution

I have an assignment where I need to compute chemical reactions by solving ODEs. I use NDSolve to do this. However, for one problem it does not give me the ...
2answers
14k views

### How to plot two sets of data on one ListLinePlot

I have two sets of x,y coordinates, and want to plot them both on the same graph. With one set, List1 $= \{ \{ x_1, y_1 \}, \{ x_2, y_2 \},\{ x_3, y_3 \}, \cdots \}$ I can use ...
1answer
3k views

1answer
432 views

### How to match two sets of data over 1 or more identifier, of unequal length?

Brief Question about how to best match lists with Criteria from Identifiers (thus for me: translate SQL to Mathematica ;) ). If I have two sets: ...
7answers
526 views

### How to efficiently Append a result of an operation on each element of a list to itself

I'm looking for the best function to apply the product of the last two elements of sublist elements to each element: Example: ...
2answers
947 views

### Working with large data, pass-by-reference, compiled functions

I think I know the answer to this, but after two days of Googling, this is my last effort before going down an unwanted path... I have a function that takes lots of large data as arguments as well as ...
2answers
1k views

### How to inject an evaluated expression into a held expression? [duplicate]

I know that there are methods to structurally manipulate held expressions (discussed e.g. here), but I failed to apply those for this particular problem: ...
1answer
504 views

### How to copy hyperlink addresses using the keyboard

I would like to copy the address of a hyperlink in Mathematica using the keyboard. I found code for copying hyperlink addresses in ContextMenus.tr: ...
1answer
521 views

### MUnit creating a hierarchy of TestSuites

I would like to create a hierarchy of TestSuites. However it appears that it is not possible to call a TestSuite from another <...
1answer
635 views

### Obtaining a thin/compact SVD

I'm using SingularValueDecomposition for a least-squares regression, the instruction that works fine for what I need is ...
2answers
601 views

### Equation solving with GroebnerBasis

I have a system of quadratic equations defined below ...
6answers
4k views

### How do you skip missing data values in a data file?

In scanning through a simple imported file of weather station data, some dates have missing data. What is a test to use to check whether a datum is valid? I tried ...
1answer
1k views

### ErrorBars with BarChart, ChartLabels are not working?

In the Add Error Bars to Charts and Plots How To in the Mathematica documentation a function ErrorBar is given: ...
5answers
6k views

### Labeling a bar chart, changing how rotated labels are centered

I'm trying to label a bar chart with rotated labels see this simple example: ...
5answers
5k views

### How to pass a symbol name to a function with any of the Hold attributes?

Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...
5answers
10k views

### What does the construct f[x_] := f[x] = … mean?

This question mentions "x := x = trickery". What does defining a function as f[x_] := f[x] = ... do and what is it good for?

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