SMath Studio v0.99 1

[charliealphabravo]

Hi all.

I'm learning SMath on the PC and I'm having trouble deleting an empty placeholder in a formula. I read that I should just be able to empty the contents of the placeholder and then shift-arrow over the blank placeholder and then back space, or double backspace, to delete it. I've tried several combinations of those actions to no avail. I am left with a placeholder that prevents the formula from completing. I will just write the whole thing over but I'm thinking there is a direct way to make the change.

Reference the black square near the beginning of the Iyy formula.

Edit: Also I have decimal places set to 2 for calculations but as you can see Ixx is still reporting to 4 places. I'm not sure why. It looks like all new formulas are reporting to 2 places.

Also also. Sorry for the unhelpful thread title. I hit submit before I checked it.

TIA

 

[Lomarandil]

I'm a SMath user, but not an expert. I share these same glitches.

I can delete empty placeholders when they are on the right end of the equation, but not when they are on the left end. I just copy/paste out the part I want, get back to one placeholder, and paste it in there.

It seems to me that the decimal place issue happens when you copy/paste -- seems that messes up the decimal/exponential settings.

----
The name is a long story -- just call me Lo.

 

[GregLocock]

I think you need to delete the operator as well to get rid of the placeholder. Also try the Insert key, it used to change the facing direction for deleting.

Cheers

Greg Locock


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[IRstuff]

Can you post the sheet?

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[Sparweb]

Had the same problem. Figured it out already. Not obvious, especially to a Mathcad user like me.
I don't think Insert key works the way it did in Mathcad.

First, you have to move the cursor until it brackets the term on the RIGHT that you want to keep. Bear with me...
Make sure that the vertical cursor line is on the LEFT side of it.
Press the BACKSPACE key. 3 times, I think.

As for the decimal places, IME the OPTIONS setting box has no effect except during the moment you create the new blank sheet. It will become the default for that sheet, whatever it was when you created it, but if you change it later, nothing will happen. Nothing predictable, that is.

Every program has its quirks.

No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF

 

[charliealphabravo]

Well I was heading into work today before I was remembered it was family day...typical American transplant.

Thanks for the help. I'll post the sheet tomorrow. So far it implements 2018 NDS bending equations if anyone is interested, nothing serious.

TTFN

 

[charliealphabravo]

@SparWeb I'm kind of impressed. I was pretty sure I tried every combination of Del/Backspc/Arrow but your steps worked to delete the empty argument. Actually, just a single backspace seems to work if you put the cursor in the right location as you describe.

With the decimal places it looks like you have to retype the expression to update the number to match the settings. Even copy/paste of the entire sheet into a new sheet does not reset it to the settings of the new sheet.

It's a WIP and not error checked yet but here is the sheet. Any suggestions are welcome. I'd like to see some other sheets as examples to get ideas from.

 

[Sparweb]

random thoughts:

I make airplanes. They haven't been made out of wood for a while. At least, not the kind I work on. What does "NDS" mean?

The figure would be more helpful if I could see 2 or more laminations together, and if they looked like they had the proportions appropriate to laminating.

I often place my result "x=#" in a column or a group. This is for readability, but it also allows me to box-select them all and then right-click to change properties of all of the fields. I can change the trailing zeros (check) and decimal places. That, at least, gets all results doing the same thing. Later I can pick 1 at a time for specific adjustments of appropriate decimal places.

You missed an opportunity to determine the inter-laminar shear stress in the adhesive bonds. VQ/It and such.

Are you ever expected to cross-reference your analysis to a source (textbook, standard, design code, etc.)?

No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF

 

[charliealphabravo]

Thanks much for the feedback and perspective. It is easy to get blind spots when working. NDS is New Denver Spruce or something I forget...

The figure is just a placeholder that I copied. The multi-ply figure is in the revision. I'm in the process of implementing the shear provisions. I'm slowly including references to the National Design Spec and whatever other sources I need. This is just to document an analysis not for design so it may never see the light of day.

I'm still researching to see if flat-use bending with multiple plies can work the way it's shown here. From what I am reading so far, it is difficult to achieve the shear transfer between the plies with nail or bolt lamination. It might be more appropriate to use the bending capacity of a single member times the number of plies rather than use the built up Iyy. Also it is not clear in the NDS if d and b (depth and width) refer to the individual plies or the full built up member when calculating beam slenderness for flat use multi-ply beams. It is even more unclear with beam/columns and stability calculations.


EDIT: Aaaaaand save often. I lost half a day yesterday when SMath crashed. No autosave feature.

 

[Lomarandil]

For dimension lumber, even if the capacity calcs work out for shear transfer between plies, nails and screws have too much slip/crushing to achieve true composite behavior. Unless you're working with a proper glulam or similar, better to treat as the combination of individual plies.



----
The name is a long story -- just call me Lo.

 

[MintJulep]

You can set the decimal places of individual expressions by right-clicking on them.