search 1d array for a value

[KevinKM]

Hi all,

I have an 1d array of numbers which ranges from 255 to 0, i want to search for an first element which is less than 100 and retrieve the index.

Can anybody help me how to go about it.

[ben64]

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kamasani a écrit :

Hi all,

I have an 1d array of numbers which ranges from 255 to 0, i want to search for an first element which is less than 100 and retrieve the index.

Can anybody help me how to go about it.

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This is an easy task, what have you tried?

hint: autoindex FOR loop, compare element with 100, if less then stop loop and index of loop is the index of element.

Have you looked at these free introduction class to LabVIEW:

3 Hour LabVIEW Introduction

6 Hour LabVIEW Introduction

Ben64

[Patrick0418]

Hi kamasani,

You can use for loop to do this program.

I hope it's helpful for you.

Tunnel mode -> Conditional. It means if TRUE will build ARRAY. 

So input array size is not equal to output array size.

For example, Input array is [0 200 50 150]. Only 0 and 50 less than 100.

Output Array is [0 2].(Index of Array)

[KevinKM]

Hi Ben64,

Thanks for the hint, it worked out. 

I need a little more help to do the following:

I want to repeat this for all the column indeces attached to the post.

• I want to extract corresponding columns
• Find the Row index

Please suggest me how to go about it.

[natasftw · Accepted solution]

Use the same ideas.  Throw one column into the array at a time.  Search.  Repeat.

The most "complex" part of this program is interfacing with the excel spreadsheet.

[mikeporter]

You do not need to index through the array. All LabVIEW low-level comparison functions are polymorphic. Take a less than comparitor and wire the input array to the top input terminal. To the bottom input wire a scalar numeric constant containing 100. The output is a boolean array of comparisons. Use the search 1d array node to search this array for the first true. The output is the index.

Done...

Mike...

[KevinKM]

Hi all,

Thanks for you replies,

I have a 2d array of size, 3969 X 600. I need to extract 1000  columns at once and search for an element less than 100 for each columns. 

The 2d array size varies for different images. So as the number of columns. 

I need your suggestions folks,

[RavensFan]

Take the Array.  Subtract 100.  Do a comparison Less than Zero.

Iterate through the array row by row.  Do AND Array Elements to find a row where every column is Less than 0.

[stevenette]

Whoa! There are tutorials online? I had no idea! If only people would reference them more often!

[altenbach]

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@stevenette wrote:

Whoa! There are tutorials online? I had no idea! If only people would reference them more often!

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Was even true in early 2015 ... 😄