Calculation
Quote from asmat on March 3, 2019, 12:01 amhow can i make an application that's calculate the value of function like this:
#two input for user
1- for value like x=3
2- for function like f(x)=x^3-2
#output button for calculating the value of function:
ans=25
how can i make an application that's calculate the value of function like this:
#two input for user
1- for value like x=3
2- for function like f(x)=x^3-2
#output button for calculating the value of function:
ans=25
Quote from Gaev on March 3, 2019, 3:33 am@asmat:
I am not sure what you are looking for; when you say ...
#two input for user
1- for value like x=3
2- for function like f(x)=x^3-2... are you saying that the user would enter BOTH the value for variable x AND the equation (x^3 - 2) ? ... if so, it would be difficult to parse any/all equations the user would enter.
However, if you are looking to provide answer to the hard coded equation for value entered for x by a user, take a look here ... https://webhelp.visualneo.com/Mathematical.html ... at the Math command ... place something like this in the click action event code of the Button ...
Math "([x]^3 - 2)" [result]1) Replace [x] with the variable associated with your Numeric Input (https://webhelp.visualneo.com/NumericInput.html)
2) You can then display the answer ...
a) either via an AlertBox command
b) or as the content of a Container
@asmat:
I am not sure what you are looking for; when you say ...
#two input for user
1- for value like x=3
2- for function like f(x)=x^3-2
... are you saying that the user would enter BOTH the value for variable x AND the equation (x^3 - 2) ? ... if so, it would be difficult to parse any/all equations the user would enter.
However, if you are looking to provide answer to the hard coded equation for value entered for x by a user, take a look here ... https://webhelp.visualneo.com/Mathematical.html ... at the Math command ... place something like this in the click action event code of the Button ...
Math "([x]^3 - 2)" [result]
1) Replace [x] with the variable associated with your Numeric Input (https://webhelp.visualneo.com/NumericInput.html)
2) You can then display the answer ...
a) either via an AlertBox command
b) or as the content of a Container
Quote from asmat on March 3, 2019, 8:40 pmI want to use variable into textInput ..example
I created a sample app with these objects:
1-TextInput with the variable of [x]
2- TextInput with variable of [y]
3-Button with code of : Math "[y]" 0 [r]
4-TextInput for result [r]
after run the application, I enter at variable [x] number like 2 and into [y] variable function like= [x]+3
now, I expect the value of the result should be 5 but the result is nothing.
how I solve this problem? is it possible or no?
I want to use variable into textInput ..example
I created a sample app with these objects:
1-TextInput with the variable of [x]
2- TextInput with variable of [y]
3-Button with code of : Math "[y]" 0 [r]
4-TextInput for result [r]
after run the application, I enter at variable [x] number like 2 and into [y] variable function like= [x]+3
now, I expect the value of the result should be 5 but the result is nothing.
how I solve this problem? is it possible or no?
Quote from Gaev on March 3, 2019, 9:04 pm@asmat:
1-TextInput with the variable of [x]
If you are working with numbers, best to use Numeric Input (not Text Input).
2- TextInput with variable of [y]
3-Button with code of : Math "[y]" 0 [r]This will NOT work ...
a) when you enter [x]+3 in the second Text Input, it will contain a TEXT (i.e. string) value of "[x]+3"
b) When you ask to do the Math command, the numeric value of [y] is zero (because TEXT does NOT have a numeric value; same as John Smith does not have a numeric value).
4-TextInput for result [r]
Again, if you want to display something, best to use a Container ... Text Input allows user to change the value.
I expect the value of the result should be 5 but the result is nothing.
how I solve this problem? is it possible or no?1) if you are trying to build some kind of generic equation calculator ... meaning that the user can enter any/every kind of equation ... then the answer is NO !!!
2) But if you are trying to build a calculator for a specific equation (or equations), you can ...
a) Setup one Numeric Input for every variable in your specific equation e.g. if the equation is x+y+3, you should set up one Numeric Input for x and another for y
b) Setup one Button to calculate each equation ... e.g. one to calculate x+y+3 and say another for x^2 + (y/2)
c) In the Click event section for the 1st Button, set up the command ...
Math "[x]+[y]+3" 0 [r1]& in the Click event section for the 1st Button, set up the command ...
Math "[x]^2 + ([y]/2)" 1 [r2]... and then use AlertBox or a Container to display [r1] and [r2]
@asmat:
1-TextInput with the variable of [x]
If you are working with numbers, best to use Numeric Input (not Text Input).
2- TextInput with variable of [y]
3-Button with code of : Math "[y]" 0 [r]
This will NOT work ...
a) when you enter [x]+3 in the second Text Input, it will contain a TEXT (i.e. string) value of "[x]+3"
b) When you ask to do the Math command, the numeric value of [y] is zero (because TEXT does NOT have a numeric value; same as John Smith does not have a numeric value).
4-TextInput for result [r]
Again, if you want to display something, best to use a Container ... Text Input allows user to change the value.
I expect the value of the result should be 5 but the result is nothing.
how I solve this problem? is it possible or no?
1) if you are trying to build some kind of generic equation calculator ... meaning that the user can enter any/every kind of equation ... then the answer is NO !!!
2) But if you are trying to build a calculator for a specific equation (or equations), you can ...
a) Setup one Numeric Input for every variable in your specific equation e.g. if the equation is x+y+3, you should set up one Numeric Input for x and another for y
b) Setup one Button to calculate each equation ... e.g. one to calculate x+y+3 and say another for x^2 + (y/2)
c) In the Click event section for the 1st Button, set up the command ...
Math "[x]+[y]+3" 0 [r1]
& in the Click event section for the 1st Button, set up the command ...
Math "[x]^2 + ([y]/2)" 1 [r2]
... and then use AlertBox or a Container to display [r1] and [r2]
Quote from asmat on March 3, 2019, 10:48 pmI was meaning a generic equation calculator.
once I created this kind of application with neobook two years ago ... at that time i used parse string function....
but now with this, I couldn't....
thank you so much for your help
I was meaning a generic equation calculator.
once I created this kind of application with neobook two years ago ... at that time i used parse string function....
but now with this, I couldn't....
thank you so much for your help
Quote from Gaev on March 3, 2019, 11:03 pm@asmat:
once I created this kind of application with neobook two years ago ... at that time i used parse string function....
but now with this, I couldn't....
Although you could do some things in NeoBook that you can't do with Javascript (Browsers forbid it because of security concerns), it might still be possible to build a limited-generic facility (with lots of code). VisualNEO Web also has a StrParse command.
If you have details of the kind of operators ... e.g. +-*/^() ... that were supported, and the NeoBook commands used to build such a facility, it might be possible to replicate it on this platform.
@asmat:
once I created this kind of application with neobook two years ago ... at that time i used parse string function....
but now with this, I couldn't....
Although you could do some things in NeoBook that you can't do with Javascript (Browsers forbid it because of security concerns), it might still be possible to build a limited-generic facility (with lots of code). VisualNEO Web also has a StrParse command.
If you have details of the kind of operators ... e.g. +-*/^() ... that were supported, and the NeoBook commands used to build such a facility, it might be possible to replicate it on this platform.
Quote from luishp on March 4, 2019, 12:28 pmafter run the application, I enter at variable [x] number like 2 and into [y] variable function like= [x]+3
now, I expect the value of the result should be 5 but the result is nothing.You can not use variable names at run time.
But you can do something like this:
- Use "x" instead of "[x]" to write your function.
- On the "Calculate" button add this code:
StrReplace "[y]" "x" "[x]" [z] "" Math "[z]" 0 [result]This will replace "x" for the value stored in [x] before performing the calculation.
You can use text fields with no problem as the Math command will convert them to numbers.Take a look at the attached app.
after run the application, I enter at variable [x] number like 2 and into [y] variable function like= [x]+3
now, I expect the value of the result should be 5 but the result is nothing.
You can not use variable names at run time.
But you can do something like this:
- Use "x" instead of "[x]" to write your function.
- On the "Calculate" button add this code:
StrReplace "[y]" "x" "[x]" [z] "" Math "[z]" 0 [result]
This will replace "x" for the value stored in [x] before performing the calculation.
You can use text fields with no problem as the Math command will convert them to numbers.
Take a look at the attached app.
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