6
votes
3answers
2k views

Save and call matrices with large output in Mathematica [duplicate]

If we have the large matrix A=RandomReal[{-10, 10}, {1000, 1000}]; and I need it for further calculation, how can I save it on hard disk and then call for ...
2
votes
1answer
1k views

How to export/import function values [duplicate]

I have a function with two variables: f[x_,y_]:=f[x,y] = ... I calculated some values (they are fractions like 435345345/3424242424) and would like to store the ...
2
votes
2answers
121 views

How to store an InterpolatingFunction? [duplicate]

Assume I have obtained an InterpolatingFunction, say, as the result of solving of a differential equation, say, this one: ...
1
vote
1answer
401 views

How to store a SparseArray? [duplicate]

How to Export/Write a SparseArray? How to Import/Read a SparseArray? Is it always stored as a normal array? How can it be stored in a dense form? Is a numerical SparseArray different to Export/Import ...
1
vote
1answer
1k views

Can an Interpolation function be 'saved'? [duplicate]

Possible Duplicate: Save interpolated function I am importing tables with sizes of 100k - 500k rows and 4 columns. The larger the table, the slower my Mathematica runs for all computations ...
2
votes
3answers
96 views

How to store the nonzero elements of a sparse array in a file? [duplicate]

Often I need to use same matrix several times and for that I save them in an external file. Converting the matrix into SparseArray can save a lot of space in this ...
2
votes
2answers
326 views

Exporting arrays for storage [duplicate]

I have a set of arrays I would like to output to some file ArrayStorage.txt s.t. these arrays could be read-in to a separate notebook on a separate kernel. Is ...
0
votes
0answers
234 views

Assign variable's value programmatically [duplicate]

Not easy to explain what I'm looking for, so please sorry if I'm not so short. Having many variables to be managed in several different combinations, I need to automate the assignment of preset ...
1
vote
0answers
145 views

Transferring a list from one notebook to another [duplicate]

I have Mathematica code split into two notebooks. The first part is supposed to run and output a list of numbers into a text file, using Export. The second part ...
3
votes
0answers
59 views

How can I append Mathematica variables to an output file preserving both names and values? [duplicate]

I have a Mathematica program that calculates a series of large vectors that I need to save for future reference (in addition to some scalar values). I want to save all these to a file, tagged by their ...
0
votes
1answer
57 views

How to save a list of analytic expressions in a file? [duplicate]

I use Mathematica to calculate many analytic expressions, some of them are generated by a loop process, the result can be a vector with a index, e.g., f[i]. Now ...
0
votes
0answers
36 views

Import/Export Cluster Object [duplicate]

I want to export and then import back in a cluster object from Agglomerate. After the import, the imported object does not behave as a cluster - for example, ClusterSplit does not recognize it as a ...
0
votes
0answers
32 views

Exporting large expression [duplicate]

I generated a huge mathematical expression (~200k terms, impossible to simplify yet) and want to save it for later analysis. Last time I did Export to *.nb file and ...
125
votes
2answers
5k views

What is the distinction between DownValues, UpValues, SubValues, and OwnValues?

When reading through the documentation, you often encounter the phrases DownValues, UpValues, ...
56
votes
7answers
2k views

Functions vs. patterns

Every time I define a new function, I wonder which construct I should use: true functions obtained by using Function, or rule-based syntax. For example, these are ...

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