Logical String Evaluation
 

Does anyone know how to evaluate a logical string in VBA? An example of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

If Month = 4 Then
... whatever

--

HTH

RP
(remove nothere from the email address if mailing direct)


"VBA Dabbler" wrote in message
...
Does anyone know how to evaluate a logical string in VBA? An example of
one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Do you mean, simply:

If Month = 4 Then
...
...
End If


"VBA Dabbler" wrote:

Does anyone know how to evaluate a logical string in VBA? An example of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

I think you mean

Application.Evaluate(month = 4)

as month is a variable, which seems a pointless use of Evaluate to me when
you can do an If

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

BTW, not a good idea to use Month as a variable name as that takes out the
VBA Month function.

--

HTH

RP
(remove nothere from the email address if mailing direct)


"VBA Dabbler" wrote in message
...
Does anyone know how to evaluate a logical string in VBA? An example of
one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Sub Tester1()
Dim m As Long
m = 4
Dim sStr As String
sStr = "m=4"
Debug.Print Evaluate(sStr)

End Sub

returns Error 2009

If that is what you were suggesting. the evaluate command has no knowledge
of VBA variables. It is a virtual worksheet cell.

--
Regards,
Tom Ogilvy


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Option Explicit

Sub a()
Dim m As String

m = "1+2=3"
Debug.Print Evaluate(m)
m = "1+2=4"
Debug.Print Evaluate(m)

End Sub

will result in (press CTRL + g)
True
False

Avoid VBA keywords as variable names... (I took m, not
Month :-)

HTH,
Bernd

Logical String Evaluation
 

Thanks for pointing me back to the evaluate method - I had tried it
unsuccessfully and started looking elsewhere.

I did get it to work.

Thanks,
VBA Dabbler

"Mark Bigelow" wrote:

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

How about showing us what works.

--
Regards,
Tom Ogilvy

"VBA Dabbler" wrote in message
...
Thanks for pointing me back to the evaluate method - I had tried it
unsuccessfully and started looking elsewhere.

I did get it to work.

Thanks,
VBA Dabbler

"Mark Bigelow" wrote:

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

No, I want to evaluate the string as though it were 'code', and the string
can change for subsequent evaluations.

The example I gave, however, would error on 'Type mismatch'.

Thanks,
VBA Dabbler

"Bob Phillips" wrote:

I think you mean

Application.Evaluate(month = 4)

as month is a variable, which seems a pointless use of Evaluate to me when
you can do an If

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

You're right. However, the string would be concatenated with literals for
comparison. Hence, if m=4, as you have it, the concatenated string to be
evaluated would be "4=4".

"Tom Ogilvy" wrote:

Sub Tester1()
Dim m As Long
m = 4
Dim sStr As String
sStr = "m=4"
Debug.Print Evaluate(sStr)

End Sub

returns Error 2009

If that is what you were suggesting. the evaluate command has no knowledge
of VBA variables. It is a virtual worksheet cell.

--
Regards,
Tom Ogilvy


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Agreed.

"Bob Phillips" wrote:

BTW, not a good idea to use Month as a variable name as that takes out the
VBA Month function.

--

HTH

RP
(remove nothere from the email address if mailing direct)


"VBA Dabbler" wrote in message
...
Does anyone know how to evaluate a logical string in VBA? An example of
one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Certainly. Try this.

MonthNumber = 4
OperatorString = "="
CriteriaValue = 4
If Evaluate(MonthNumber & OperatorString & CriteriaValue) Then
Msgbox "It Works!"
End If

"Tom Ogilvy" wrote:

How about showing us what works.

--
Regards,
Tom Ogilvy

"VBA Dabbler" wrote in message
...
Thanks for pointing me back to the evaluate method - I had tried it
unsuccessfully and started looking elsewhere.

I did get it to work.

Thanks,
VBA Dabbler

"Mark Bigelow" wrote:

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

I was responding to Mark.

--

HTH

RP
(remove nothere from the email address if mailing direct)


"VBA Dabbler" wrote in message
...
No, I want to evaluate the string as though it were 'code', and the string
can change for subsequent evaluations.

The example I gave, however, would error on 'Type mismatch'.

Thanks,
VBA Dabbler

"Bob Phillips" wrote:

I think you mean

Application.Evaluate(month = 4)

as month is a variable, which seems a pointless use of Evaluate to me
when
you can do an If

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An
example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Hello,

I tried it and something else:

Sub OddStuff()
Dim mNum As Long, opStr As String, myCrit As Long
mNum = 4
opStr = "="
myCrit = 4
If Evaluate(mNum & opStr & myCrit) Then _
MsgBox "It Works! But not very well!"
End Sub

Sub ConventionalVB()
Dim mNum As String
Const MY_CRIT As Long = 4
Let mNum = "Month=4"
If Val(Mid$(mNum, InStr(1, mNum, "=", vbBinaryCompare) + 1, Len(mNum))) _
= MY_CRIT Then MsgBox "It Works!"
End Sub

Looks like OddStuff() is about ~450% slower on a single call and ~1,050%
slower on ten thousand calls, never mind the fact that it won't work in a
non-Excel environment.

If I was trying to parse a string, I might just do that.

Regards,
Nate Oliver

Logical String Evaluation
 

Nate,

Two points

You method doesn't allow an operator, that is presumably why the OP opted
for Evaluate.

It is 10 times quicker to use a simple If test. In fact, even allowing for
an operator like so
n = Timer
For i = 1 To 1000000
mNum = 4
Select Case opStr
Case "<": j = mNum < 4
Case "": j = mNum 4
Case "<": j = mNum < 4
Case "=": j = mNum = 4
End Select
Next i
Debug.Print "SimpleVB=" & Timer - n

is twice as quick as yours.

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Nate Oliver" wrote in message
...
Hello,

I tried it and something else:

Sub OddStuff()
Dim mNum As Long, opStr As String, myCrit As Long
mNum = 4
opStr = "="
myCrit = 4
If Evaluate(mNum & opStr & myCrit) Then _
MsgBox "It Works! But not very well!"
End Sub

Sub ConventionalVB()
Dim mNum As String
Const MY_CRIT As Long = 4
Let mNum = "Month=4"
If Val(Mid$(mNum, InStr(1, mNum, "=", vbBinaryCompare) + 1, Len(mNum))) _
= MY_CRIT Then MsgBox "It Works!"
End Sub

Looks like OddStuff() is about ~450% slower on a single call and ~1,050%
slower on ten thousand calls, never mind the fact that it won't work in a
non-Excel environment.

If I was trying to parse a string, I might just do that.

Regards,
Nate Oliver

Logical String Evaluation
 

Bob,

Two points:

1) "=" is the operator in my sub.

2) We're clearly working with different assumptions.

You're assuming mNum is passed to the routine as Long Integer, if it is then
I agree, drop all of this monkey business, it's a no brainer.

I assumed mNum is passed to the Sub as a String, in which case, parse it the
way most experienced VB[A] developers would.

Regards,
Nate Oliver

Logical String Evaluation
 

"Nate Oliver" wrote in message
...
Bob,

Two points:

1) "=" is the operator in my sub.

But that is not a variable as it is part of the formula. The only way you
can make it variable without code change is using Evaluate!

2) We're clearly working with different assumptions.

You're assuming mNum is passed to the routine as Long Integer, if it is
then
I agree, drop all of this monkey business, it's a no brainer.

No I am assuming that Month is a variable, because we were told it is so, so
we don't need a string assumption, in fact assuming something when told
otherwise is perveres.

I assumed mNum is passed to the Sub as a String, in which case, parse it
the
way most experienced VB[A] developers would.

Oooh!

Logical String Evaluation
 

That's fine, but that isn't what you originally asked.

your code does

Evaluate("4=4")

But thanks for clearing it up.


--
Regards,
Tom Ogilvy


"VBA Dabbler" wrote in message
...
Certainly. Try this.

MonthNumber = 4
OperatorString = "="
CriteriaValue = 4
If Evaluate(MonthNumber & OperatorString & CriteriaValue) Then
Msgbox "It Works!"
End If

"Tom Ogilvy" wrote:

How about showing us what works.

--
Regards,
Tom Ogilvy

"VBA Dabbler" wrote in message
...
Thanks for pointing me back to the evaluate method - I had tried it
unsuccessfully and started looking elsewhere.

I did get it to work.

Thanks,
VBA Dabbler

"Mark Bigelow" wrote:

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An
example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

An example of one
is:

"Month=4"

Again, that isn't the question you asked.

--
Regards,
Tom Ogilvy


"VBA Dabbler" wrote in message
...
You're right. However, the string would be concatenated with literals for
comparison. Hence, if m=4, as you have it, the concatenated string to be
evaluated would be "4=4".

"Tom Ogilvy" wrote:

Sub Tester1()
Dim m As Long
m = 4
Dim sStr As String
sStr = "m=4"
Debug.Print Evaluate(sStr)

End Sub

returns Error 2009

If that is what you were suggesting. the evaluate command has no
knowledge
of VBA variables. It is a virtual worksheet cell.

--
Regards,
Tom Ogilvy


"Mark Bigelow" wrote in message
oups.com...
Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An
example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler

Logical String Evaluation
 

Bob,

I did get a little of track there, sorry, wasn't sure why we were building
strings and concatenating, etc...

Looks like the Select Case procedure you posted does just fine.

Regards,
NPO

Logical String Evaluation
 

This is reminiscent of yesterday when (in the VB6 forum) somebody said, "only
REAL programmers use zero-based arrays." Like we're not programmers if we
choose to start counting at one. ;)


I assumed mNum is passed to the Sub as a String, in which case, parse it
the
way most experienced VB[A] developers would.

Oooh!

Logical String Evaluation
 

Well, that's going to be tricky if you coerce a range to an array, and it
doesn't make one fake!

And, it was qualified with the word 'most'. So, please don't be too quick to
put words in my mouth.

And, I was on the wrong track, which didn't help much, there's nothing to
parse.

Regards,
NPO

"Charlie" wrote:

This is reminiscent of yesterday when (in the VB6 forum) somebody said, "only
REAL programmers use zero-based arrays." Like we're not programmers if we
choose to start counting at one. ;)


I assumed mNum is passed to the Sub as a String, in which case, parse it
the
way most experienced VB[A] developers would.

Oooh!

Logical String Evaluation
 

Hello!! I wasn't talking about YOU, I was talking about somebody else.

"Nate Oliver" wrote:

And, it was qualified with the word 'most'. So, please don't be too quick to
put words in my mouth.

Logical String Evaluation
 

What me? I didn't say '...the way most experienced VB[A] developers would'


"Charlie" wrote in message
...
Hello!! I wasn't talking about YOU, I was talking about somebody else.

"Nate Oliver" wrote:

And, it was qualified with the word 'most'. So, please don't be too
quick to
put words in my mouth.

Logical String Evaluation
 

Nate,

Yeah shame it derailed a little, as I thought that your point on time and
performance was a good, valid point. I confused it a little by re-iterating
what I had said to the OP earlier, that as far as I could see, all he wanted
was
If Month = 4 Then
without using Month as a variable name of course :-).

That will teach me to try and make two points at once :-). No harm done
though.

Regards

Bob



--

HTH

RP
(remove nothere from the email address if mailing direct)


"Nate Oliver" wrote in message
...
Bob,

I did get a little of track there, sorry, wasn't sure why we were building
strings and concatenating, etc...

Looks like the Select Case procedure you posted does just fine.

Regards,
NPO

Logical String Evaluation
 

No, sorry, I meant that someone else yesterday said, "only REAL
programmers...", and Nate's comment REMINDED me of that. But I wasn't
putting words into his mouth. Oh well, I guess I shouldn't have jumped in! :)

"Bob Phillips" wrote:

What me? I didn't say '...the way most experienced VB[A] developers would'


"Charlie" wrote in message
...
Hello!! I wasn't talking about YOU, I was talking about somebody else.

"Nate Oliver" wrote:

And, it was qualified with the word 'most'. So, please don't be too
quick to
put words in my mouth.

Logical String Evaluation
 

Whew! I thought you had jumped in to support me, then I got confused <ebg

Regards

Bob


"Charlie" wrote in message
...
No, sorry, I meant that someone else yesterday said, "only REAL
programmers...", and Nate's comment REMINDED me of that. But I wasn't
putting words into his mouth. Oh well, I guess I shouldn't have jumped
in! :)

"Bob Phillips" wrote:

What me? I didn't say '...the way most experienced VB[A] developers
would'


"Charlie" wrote in message
...
Hello!! I wasn't talking about YOU, I was talking about somebody
else.

"Nate Oliver" wrote:

And, it was qualified with the word 'most'. So, please don't be too
quick to
put words in my mouth.

Logical String Evaluation
 

Tom,
You're right, that isn't what I literally asked. I thought my final
statement implied a replacement of the 'Month' variable prior to evaluation.
I didn't mean to mislead.

Sorry for the confusion.

Regards,
VBA Dabbler

"Tom Ogilvy" wrote:

That's fine, but that isn't what you originally asked.

your code does

Evaluate("4=4")

But thanks for clearing it up.


--
Regards,
Tom Ogilvy


"VBA Dabbler" wrote in message
...
Certainly. Try this.

MonthNumber = 4
OperatorString = "="
CriteriaValue = 4
If Evaluate(MonthNumber & OperatorString & CriteriaValue) Then
Msgbox "It Works!"
End If

"Tom Ogilvy" wrote:

How about showing us what works.

--
Regards,
Tom Ogilvy

"VBA Dabbler" wrote in message
...
Thanks for pointing me back to the evaluate method - I had tried it
unsuccessfully and started looking elsewhere.

I did get it to work.

Thanks,
VBA Dabbler

"Mark Bigelow" wrote:

Try:

Application.Evaluate("Month=4")

Mark

VBA Dabbler wrote:
Does anyone know how to evaluate a logical string in VBA? An
example
of one
is:

"Month=4"

If the variable 'Month' is 4, then the string would be true.

Thanks,
VBA Dabbler