Input data type of Matlab script node

[changshin]

Hi,

I have 1D array of complex number in single precision.

Matlab script node is used to import data into Matlab and do some data processing, and then export.

Data type of input is currently double precision.

How to re-define this input data type of the Matlab script node?

Thanks,

[mishkin]

changshin,

you can change the data type of the input like this: 

However, the node does not support arrays of single precision numbers. Instead, to eliminate coersion, you'll have to convert your input array of singles into a double array by using "To Double Precision Float" VI (Numeric > Conversion).

[changshin]

That's what I have in my code at this point.

Since the size of the data is large, which cause large memory usage, I want to import the data in single precision.

From you reply, it seems that Matlab Script node does not support single precision complex. Is it right?

Another question regarding memory.

This VI, which transfer data to the Matlab Script node, and receive processed data back.

Now when we look at the profile of the memory, this VI uses large memory.

My question is that the memory usage shown on the profile for this VI includes the memory usage of the Matlab. Is this right?

Thanks,

[mishkin]

Right, arrays of singles are not supported. See Comparison of MathScript RT Module and the MATLAB® Software Data Types in LabVIEW

As for memory usage, Profiling the VI should let you know how much memory Labview uses when running your code. Communication with MATLAB® is done through ActiveX, and I'm actually not 100% sure whether it will reflect memory usage from script execution. I think it'll be simple enough to profile your VI with and without the MATLAB Script node and note the memory usage difference...

[changshin]

OK.

Thankyou.