Read file and load into two separate arrays

[FredTest]

Hello to all,

I want to read a file of 100 elements. Out of these 100 elements, I want to load the first 50 into an array called "high" and the remainding 50 into an array called "low"

I am new to CVI, how can I do this?

So far I can load the first 50 into high but am having the issue with the remainder. I am using the following code.

FileToArray ("C:\\data.ini", high, VAL_DOUBLE, 50, 1, VAL_GROUPS_TOGETHER, VAL_GROUPS_AS_COLUMNS, fileType);

Thanks!

[RobertoBozzolo]

The easiest thing is to use Copy1D functions into the Analisys library. Y could use the following:

1. Dimension a temporary array of 100 elements (calloc...)
2. Read all the content of your file into tat temporary array:

FileToArray ("C:\\data.ini", temp, VAL_DOUBLE, 100, 1, VAL_GROUPS_TOGETHER, VAL_GROUPS_AS_COLUMNS, fileType);

3. Copy the firts half to High array:

Copy1D (temp, 50, High);

4. Copy the second half to Low array:

Copy1D (temp + 50, 50, Low);

5. Free your temporary array

[FredTest]

Thanks-Alot-Roberto,

What if...

On my text file, I want to place headers.

Currently my file is...

1.0

2.0

3.0

4.0

what if my file were to be...

high[0] = 1.0

high[1] = 2.0

low[0] = 1.0

low[1] = 2.0

I modified the code and received this error

FileToArray ("C:\\data.ini", array, VAL_CHAR, 10, 1, VAL_DATA_MULTIPLEXED, VAL_GROUPS_AS_COLUMNS, fileType);
Copy1D (array, 5, high);
Copy1D (array + 5, 5, low);

134, 27   Type error in argument 1 to `Copy1D'; found 'pointer to char' expected 'pointer to const double'.

"Does this mean I can't use the Copy1D function?

[RobertoBozzolo]

---

@FredTest wrote:

Does this mean I can't use the Copy1D function?

---

Exactly! Copy1D, like almost all the functions in the Analisys library, treats ONLY double precision variables and arrays.

To read a file with the structure that you are tracing you'll have to read it line-by-line and scan the rows to separate header from data: I suggest you to use OpenFile, ReadLine, Scan or sprintf and CloseFile functions to accomplish this task.

Another options could be to give a slightly modified structure to your file and treat it as an INI file with the appropriate instrument driver. Supposing your file can be arranged in this or similar way:

[DataHigh]

high0 = 1.0

high1 = 2.0

[Datalow]

low0 = 1.0

low1 = 2.0

you could use IniFile instrument driver ( \toolslib\toolbox\inifile.fp ) to read the file element by element.