NEW USER : Using MATRICES

[KAK2401]

Hi,

I have downloaded the LabView 6.1 and first time in my life I am using it.

First of all I am looking for online tutorial with examples, if you point me
a site that would be great.

Now here is my question. I have transfer matrix in my code. So 1 angel data
is input to the FUNCTION and I want to get output as a matrix and after I
get it I wanto make matrices operations like multiply.

I check out the array code and if I have to use 3x3 matrix I have to give
the values like that

int16 a[3][3];
a[1][1]=0;
a[1][2]=sin(theta);
a[1][3]=cos(theta);
.... (and so on)

Can you please advice me steps to do this operation?

If it is a too easy question please just point me a book or a website.

TIA


regards,

[Jim_Kring]

For matrix math, look at the linear algebra VIs.

To create an array use "initialize array". To replace elements in an array, use "replace array subset". You can save a step by using "build array", to construct it out of all the values you want.

Good luck,

Jim

[BrandonS]

I have a simple VI that demonstrates some of the methods for generating arrays in LabVIEW. It is a simple example but it illustrates 3 different methods for generating arrays.

[Poormanphysics]

Hello:

I have ECG recordings that last from few minutes to hours all of them are digitized in some binary format each data point in corresponding time of acquisition (msec). Now, if I read them into an array from a binary file reader VI they span several hundred columns (a row vector) of data points each is like in the 10e9 magnitude (from direct reading) now I would like to rescale them back to mV level by multiplying each of the data points by some constant factor. I know that  I have to create an equivalent order vector to have a point by point multiplication I would like to ask for suggestion on how to efficiently handle this?

Thanks,

Berns B.

[alkazaa]

---

@Dr.Berns wrote:
Hello:

I have ECG recordings that last from few minutes to hours all of them are digitized in some binary format each data point in corresponding time of acquisition (msec). Now, if I read them into an array from a binary file reader VI they span several hundred columns (a row vector) of data points each is like in the 10e9 magnitude (from direct reading) now I would like to rescale them back to mV level by multiplying each of the data points by some constant factor. I know that  I have to create an equivalent order vector to have a point by point multiplication I would like to ask for suggestion on how to efficiently handle this?

Thanks,

Berns B.

---

Use the multiply node from the numeric pallette. If you wire a scalar constant to the second input it multiplies an  n-dimensional array elementwise with that constant. See attached example.


-Franz

[Poormanphysics]

Franz thank you! Now how could I possibly missed that and actually did. I was clicking my wiring tool so that my multiplier was requiring an array and NOT a constant!
Here is the code snippet diagram. You might guess it right I was converting an ECG record to a DAC output for injecting it to my analog input channel.

Thanks again.

Berns B.