labview/ matlab interface

[shreya005]

I have a LabVIEW program which has a subVI which calls a MatLab program to read some files and perform some calculations (screenshot attached). I want to make some changes in the program such that when a button is switched on in LabVIEW the MatLab code reads file (a) and when it is off, it reads file (b). How do I such an interface between LabVIEW and MatLab? 

[mikeporter]

Can you pass the filename into the math script node as a parameter?

Mike...

[natasftw]

Why not make the path an input to the subVI and use a case structure in your main VI to determine the path prior to calling the subVI?

[shreya005]

%electricity price
Eprice_72per = xlsread('price.csv','D2:D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('price.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('price.csv','B2:B73'); 

This is the original part of the program. But I want something like this:

%electricity price

if (Boolean_fromLabVIEW = true)

Eprice_72per = xlsread('sameprice.csv','D2:D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('sameprice.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('sameprice.csv','B2:B73'); 

else

Eprice_72per = xlsread('price.csv','D2:D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('price.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('price.csv','B2:B73'); 

I tried adding nodes to the MathScript on the LabVIEW program, but it shows the following error:

So what you're saying is wire the boolean to a case structure or select function and pass the path of the files through the node depending on boolean value? 

[shreya005]

Sorry about the smileys, code:

Eprice_72per = xlsread('price.csv','D2 : D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('price.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('price.csv','B2:B73'); 

This is the original part of the program. But I want something like this:

%electricity price

if (Boolean_fromLabVIEW = true)

Eprice_72per = xlsread('sameprice.csv','D2 : D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('sameprice.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('sameprice.csv','B2:B73'); 

else

Eprice_72per = xlsread('price.csv','D2 : D73')/1000; 
[num,EpricePeriod1,raw] = xlsread('price.csv','A2:A73'); 
[num,EpricePeriod2,raw] = xlsread('price.csv','B2:B73'); 

[natasftw]

Did the code work before you made changes?  If so, change all references to a file to match the file you want.

But, what are you really gaining from this?  What is the script doing that you cannot do easily without involving the mathscript node?

[shreya005]

This is just part of the code, the actual code is 1600 lines long. 😛 (written by someone else)

The line:

if (Boolean_fromLabVIEW = true)

was just to give you a clearer idea of what i want to achieve. the problem is how do i make matlab read the status of this boolean button and act accordingly!

[natasftw]

If that's your issue, you're asking how to debug matlab code.  You'd want to do that on the mathworks forums.

People here help with LabVIEW code. 

[shreya005]

I just want to know how to pass the boolean from LabVIEW to MatLab, the code is not an issue.