Questions about getting data, files, images etc. from various formats into a form that can be read, tranformed and manipulated by Mathematica

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2
votes
2answers
131 views

How to rearrange structure and type of an imported dataset?

I have a bigger dataset imported from Excel. Its elements have a form of {time, data}. Day is irrelevant and I would like to have the time in decimal form e.g. 10:30 is 10.5 ...
0
votes
2answers
331 views

Import table from txt file with specific rows

I have a .txt file written as 1 2 3 4 5 6 7 8 9 10 11 12 I would like to import it as three matrices according to the rows. I used b = Import["d:\am.txt", {"Table", Range[1, 2]}] Seems it ...
2
votes
1answer
349 views

How can I download images from Instagram and Twitter?

The new function ServiceExecute seems to suggest the ability to download images containing a specific hashtags. Can anyone get this to work?
0
votes
0answers
169 views

Set first line in CSV as header in mathematica list

New to stackexchange. Need some help with mathematica - also new to this!. I have a CSV file with 80 something columns and 6000 something rows = 500,000ish elements in total. I am trying to import ...
0
votes
1answer
91 views

reading data, one number at a time, from file to be used in a formula

First off let me say that I am a total nube. I saw some examples of answers "close" to my question but I did not understand them :-( I want to read individual numbers in from a text file and have ...
0
votes
1answer
74 views

How to get an elements of given class that generated by javascripts

I want to get the number of total pages of a given search resluts of this site: http://srh.bankofchina.com/search/whpj/searchen.jsp, e.g., from 2015-1-12 to 2015-1-13 the currency of USD by the ...
0
votes
2answers
2k views

Import a given column from an excel file? [closed]

It seems that I can get the first column of excle data, say "test.xls", if I know the total length... ...
3
votes
1answer
114 views

Local evaluation works, CloudDeploy did not work

I a playing around with my programming cloud account. What I have found, interactive functions often are not working because there are several details that are not implemented into the cloud. So I ...
0
votes
0answers
89 views

ViewPoint: Saving coordinates in a text file

How should I save (Export?), all coordinates of the ViewPoint, in a text file when I rotate the ...
4
votes
1answer
365 views

Using the variable in the MATLAB workspace using MATLink or any other packages

I have a program in MATLAB and after I run the program, I get some results in MATLAB's workspace. Now, I need to use these results in Mathematica. What I currently do is that I save the workspace as a ...
2
votes
1answer
453 views

Import symbolic variables from Matlab with MATLink

I'm trying to manipulate with Mathematica symbolic expression created in Matlab. I'm using the MATLink package, and I've succedeed in importing numerical variables, but not symbolic ones : ...
1
vote
1answer
107 views

Importing a text file

I have a *.txt file with values like so: 0 2 4 3 4 2 the position in this huge *.txt ...
15
votes
2answers
833 views

Get both output and return code of external program

Run["program"] will run an external program and return the return code. Import["!program", "String"] will run the program and ...
5
votes
0answers
2k views

Import Large Excel File

Currently, I am working on a large time series dataset, which contains 928,586 rows and 35 time intervals in columns, in excel format (.xlsx) and using Import to ...
8
votes
1answer
127 views

Is it possible to move .mx file from one server to other?

I have mathematica file in one server along with .mx file. Is there any way to move the .mx file from one server to other such ...
2
votes
1answer
194 views

How to get a audio file's duration time in Mathematica?

I have a *.avi file and if I want to know the file's duration time: I can use this code to get the result: Import["test.avi", "Duration"] or the code to get the ...
7
votes
1answer
281 views

Assign the contents of a “Copy” operation programmatically to a variable?

While an earlier question Cut and paste data from a spreadsheet nominally addresses the issue, a year has past since its OP asked it and I hope that others have come across simpler or more direct ...
2
votes
4answers
4k views

Plotting a large number of data points

I would like to know how to plot when I have a large number of points (arround 600) in a specific format: ...
3
votes
3answers
1k views

Import data from first/last 100 rows of a file

If one wants import data from the first three rows of a file "myfile.data", one can use the command Import["myfile.data",{"Data",{1,2,3},All}]; However, if I ...
1
vote
2answers
167 views

Table operation after export and import of data does not give me the same result

If I create a table of this kind: (m1 = Table[{RandomInteger[], RandomInteger[{1, 5}, {3}]}, {i, 1, 5}]) // MatrixForm which looks like I know how to pick ...
2
votes
1answer
91 views

List Manipulation and Removing Cases

I've imported a large data set, manually removing headers in the .rtf file where it originates. However, when I import this data, I receive this output: ...
5
votes
0answers
267 views

ImportString JSON possible bug

My problem is when I catch up some json output of whatever method and process it with ImportString[%, "JSON"], The first time ...
1
vote
2answers
178 views

Save file from URL using mathematica

Is there an easy way to download and save a .zip file from a URL to my computer through Mathematica? I am trying to develop an auto-update function for a mathematica package that is distributed via ...
0
votes
1answer
70 views

Elegant ways of solving this file batching task

There are a batch of data files in a folder (dir = "D:\\Documents\\datadir"), each of which consists of a list of data items, one per line. Each data item is a pair ...
9
votes
1answer
297 views

How to use RunProcess to import external function?

I have a functions written in an external language called GO. How can I quickly load them into the kernel for use as Mathematica functions? The two ways I've tried are with MathLink and LibraryLink ...
0
votes
2answers
116 views

File Handling. How to save the progress in a file?

Assuming I already have the file created. I have a programme that,returns an output, in our case number. I want Mathematica to save this number in a file, together with results saved from previous ...
8
votes
4answers
1k views
3
votes
1answer
414 views

Efficiently reading CSV with ReadList

I have a large CSV file (~1gb) with mixed data. Basically with strings and integers. It takes very long to import this whole dataset with Import[] so I would like ...
4
votes
1answer
432 views

CSV vs XLS for import

I need to import data from various database sources. At the moment I plan on importing files via a CSV file or XLS. All the data if in XLS would be on one sheet (notebook). Are there any advantages ...
4
votes
0answers
114 views

Import Excel data forcing links (ie workbooks) to be updated

We have noticed importing data from an Excel spreadsheet doesn’t update links. The problem with this is if you import a spreadsheet that comprises of linked workbooks data and those workbooks have ...
10
votes
3answers
3k views

Skip header lines on import

When importing a data file what are the comment symbols for Mathematica? That is, given a file like this blabla bulbul 1 2 6 54 7 ... .. what symbol do I have ...
1
vote
3answers
500 views

How to import files with headers?

R has excellent header supports such as read.table with header options. I don't want to mess up with text-processing or stream-processing. I am looking for a similar tool as in R because it saves a ...
7
votes
1answer
266 views

Incorrect result while using SemanticImport for CSV file import

I might use this incorrectly. I want to use a .csv file that (as list) looks like: ...
1
vote
0answers
266 views

InstallJava::fail error when importing an image with a Raspberry Pi

I'm trying to import an image in Mathematica on my Raspberry Pi. The code is simple but I get an error when importing: ...
43
votes
8answers
8k views

How do you convert a string containing a number in C scientific notation to a Mathematica number?

Suppose I have a string containing the C-representation of a floating point number, for example s = "1.23e-5" and I want to convert this to a Mathematica number. ...
1
vote
1answer
68 views

Importing file as a string causes a puzzle

I generate simple txt file and import it as follows: a = Import["binary.txt"]; b = Import["binary.txt", "String"]. It appears then that lengths of imported strings ...
2
votes
2answers
146 views

Why can't I import a file in the init.m file?

I would like to have some data read in every time the kernel starts, but it doesn't seem to work. Say I have a CSV file I want to have read in, for example I use: ...
6
votes
1answer
238 views

HDF5 and complex numbers

I "Export" an array with complex numbers with HDF5 format. When I "Import" it, I only get the real part. Simple example: ...
2
votes
1answer
612 views

How to work with 3D images of STL format

After importing a 3D image of STL format, my possibilities in regard to "3D Volumetric Image Processing" seems rather limited. All examples are given with TIFF files. Is there a way to convert from ...
4
votes
0answers
112 views

Monitor progress of ZIP file extraction

Importing a ZIP file containing potentially many individual files in a (custom) format using Import[filename, {{"*"}, "Gaussian"}] takes quite a while. How can I ...
0
votes
3answers
298 views

Importing multiple files with a loop

I have 101 files with data that I want to import into Mathematica. All the file names are numbered as follows datafile.20.0000.out, datafile.20.1000.out, datafile.20.2000.out and so on. I used the ...
15
votes
3answers
668 views

How to Import random elements of huge data files

I am calculating huge data files with an external program. I would like then to import the data into Mathematica for analysis. The files are 2 columns and up to many millions of rows. So for ...
2
votes
1answer
74 views

Customized directory import

I have defined a function in a package to import some data files under a directory which is produced by a scanning device (LS55): ...
7
votes
1answer
427 views

Creating time-lapse movies with Mathematica

Well, my question is this: Is that possible to make time-lapse movies with Mathematica? Here is some more explanation: Watch this YouTube video that is a wonderful example of time-lapse movies. Time-...
0
votes
2answers
79 views

Use modified part of file path as new file name

i want to import an image, modify it and then export the modified image. Something like this: img = Import["C:\\Images\\e4271-5.jpg"] Some modifications ...
3
votes
2answers
558 views

Convert imported PDF to an image

I've looked through the forum and have not seen an answer for this. I would like to be able to import a pdf document in which each page contains an QR code. I want to then use the Barcode reader ...
6
votes
2answers
353 views

Importing multiple images for machine learning classification

I want to create a ML classifier using images just like this example. I have two classes of images in two different folders. Is there an easier way to import all images from both folders rather than ...
17
votes
2answers
2k views

Dealing with large files

I have a *.dat file in which the contents are basically one giant list: {1,2,3,4} {5,6,7,8} {9,10,11,12} and so on. I'd like to read in the first 500 members { }...
2
votes
2answers
504 views

Sound data Import Export

Can't regain the data after Export. Create an array of sampled amplitude values: 2. Visualize as sound 3. Save it 4. Get it back 5. ??? ...
3
votes
1answer
508 views

Easiest way to parse semi-structured text file

I have a plain text file with some data. I need two things: Be able to extract certain values for the various field, e.g. to extract the 'Mean Dose [%]', that is to extract number ...