manufacturer | Manufacturer module for Invoice Ninja | Authentication library

You will need 2 $group stages, first group by manufacturer and country, then group by manufacturer alone.

The 3'rd stage is to format "countries" array to an object.

Instead of having where WARRANTY_IN_YEARS>3, your question states

...only if the average warranty of the manufacturer is more than 3 years

The key word is AVERAGE.

To filter based on an aggregate function, you will need to use the filter in your HAVING clause and not your WHERE clause like this:

Tidyverse solution: You use your inputs to filter the dataset, right before plotting it. Therefore you need to get the data in long format with tidyr::pivot_longer() before.
Afterwards you can filter here:

As mentioned in comments your xml document has namespace definitions in its DocumentElement (xmlns stands for xml name space). Furthermore "it contains a default namespace so any attempted parsing on named nodes must map to this namespace URI otherwise returns nothing."

To allow eventual analysis it's necessary to include a user defined prefix (e.g. :s) into explicit namespace settings, which can be used in later XPath expressions:

Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:

• the memory architecture of the target computer,
• the architecture and communication pathways to the display controller,
• character glyph height and width in pixels and
• the amount of memory for bitmap storage and what measures are taken to make that as small as possible.

A brief overview of bitmap fonts

A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.

Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts

A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.

A brief history of using bitmap fonts

The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.

Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.

With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.

In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.

Representation of bitmap fonts in source code

There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format

The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.

Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.

As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.

However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:

Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:

You need to specify the namespace in your call for Descendants:

be sure you have proper composite (and someway rendendat) indexes on

It's because you st your variable at the documentReady event callback. So the var has the default value (the value at the documentReady moment).

move it in the submit event:

The Rescale Intercept (0028,1052) and the Rescale Slope (0028,1053) are standard DICOM tags.

As you already said in question, the Scale Slope (probably (2005,100E)) is a Private Tag - specific to the Equipment Manufacturer. So, only manufacturer may say something reliable about this.

Private tags do not have standard names; generally, manufacturers mention the details of private tags they created in their DICOM Conformance Statement or other similar document. They may also name the tag in that document. Please refer to this answer for more details.

Now, to your question -- what is the difference?
Considering what I said above, it is hard to answer this question. Meaning and usage of standard tags can be found in standards. It is not the case with private tags. You have to go through vendor specific documents to understand it in details (if they mention it in details).

Even so, a quick googling give me this and this. One of the post in thread discusses about usage of Scale Slope in a mathematical formula.

If you open a PAR/REC header you will see the Phiips description of these values
//# === PIXEL VALUES =============================================================
//# PV = pixel value in REC file, FP = floating point value, DV = displayed value on console
//# RS = rescale slope, RI = rescale intercept, SS = scale slope
//# DV = PV * RS + RI FP = DV / (RS * SS)

and

Inputs:
R = raw stored value of voxel in DICOM without scaling
WS = RealWorldValue slope (0040,9225) "PhilipsRWVSlope"
WI = RealWorldValue intercept (0040,9224) "PhilipsRWVIntercept"
RS = rescale slope (0028,1053) "PhilipsRescaleSlope"
RI = rescale intercept (0028,1052) "PhilipsRescaleIntercept"
SS = scale slope (2005,100E) "PhilipsScaleSlope"
Outputs:
W = real world value
P = precise value
D = displayed value
Formulas:
W = R * WS + WI
D = R * RS + RI
P = D / (RS * SS)