Question: I'm using tumblr CSS and I want certain symbols, like `/` (slash) to always appear in **bold** even when the main text is not. I know I can use `<b>/</b>`, but I was wondering if there is another way.

For example, I know how to format all `<small>` text to appear in bold:

```
small { 
  font-weight: bold;
}

```

I would like to use the same method to automatically transform `/` to **bold**.

Answer: 
Ressample with dataset should do the trick as far as I understand. 

* First generate a line using the line source
* open your 2D dataset containing the discontinuous U field.
* Use ressample with dataset on your dataset and use the line source as source input
* You now have a line which contains the field defined on your datasets

If you need to do some computation on it, you can then use a calculator or a programmable filter.
I put together a Programmable Filter.
I do not know if this is the most efficient way to do it, but it works.

```
programmableFilter1 = ProgrammableFilter(Input=[plotOverLineBot,plotOverLineTop])
programmableFilter1.Script = """
import vtk.util.numpy_support as ns
import numpy as np

input_bot = self.GetInputDataObject(0, 0);
input_top = self.GetInputDataObject(0, 1);
output = self.GetPolyDataOutput()
#output.ShallowCopy(input_bot)

npts_bot = input_bot.GetNumberOfPoints()
npts_top = input_top.GetNumberOfPoints()
if ( npts_bot == npts_top ) :
    print( "Number of points: " + str(npts_bot) )
    u_bot = input_bot.GetPointData().GetArray("displacement")
    u_top = input_top.GetPointData().GetArray("displacement")
    u_bot_np = ns.vtk_to_numpy(u_bot)
    u_top_np = ns.vtk_to_numpy(u_top)
    u_jump_np = np.subtract(u_top_np, u_bot_np)
    u_jump = ns.numpy_to_vtk(u_jump_np)
    u_jump.SetName("displacement jump");
    output.GetPointData().AddArray(u_jump)
else :
    pass
"""

programmableFilter1.RequestInformationScript = ''
programmableFilter1.RequestUpdateExtentScript = ''
programmableFilter1.PythonPath = ''
RenameSource("Programmable Filter - Jumps", programmableFilter1)

```