[HELP] Lego EV3 Calculator

[Technic Jim]

Hello all,

I have been working on a Lego EV3 calculator recently and have incorporated quite a few functions into it.However, there are two functions I would like to add that I don't currently have. The functions that are already in it are as follows:

1. Add
   
2. Subtract
   
3. Multiply
   
4. Divide
   
5. Exponential
   
6. Square root
   
7. Factorial (this was a pain to make!)
   
8. Sin
   
9. ASin
   
10. Cos
    
11. ACos
    
12. Tan
    
13. ATan
    

The two that I would like to add are an Xth root of Y function and a Log() function. If anyone knows any way I can program these blocks or any ways you have seen yourself, please post a reply!

Thanks, Jim

[__________________________]

Interesting, I do not know how.

[BusterHaus]

You can write the Xth root of any number as the number with an exponent of 1/X. You already have the exponent function, time to apply it.

Log() will also use the exponent function, this time a base number N with an exponent of X (X is your variable, N is defined once).

Edited June 17, 2016 by BusterHaus

[TheMindGarage]

Finding the Xth root of Y is not too difficult. If you can make an x^y function, finding the xth root of y is basically doing y^1/x.

As for log, there is a Log function in the Advanced section of the math block. If you want log of any number, use this: log_a x = ln x / ln a. If you prefer to work with log₁₀ instead of ln, it will work as well.

Curious as to how you did the factorial. I'm guessing it was using recursion.

[Technic Jim]

You can write the Xth root of any number as the number with an exponent of 1/X. You already have the exponent function, time to apply it.

Log() will also use the exponent function, this time a base number N with an exponent of X (X is your variable, N is defined once).

Thanks, but what do you mean about the Log function?

Finding the Xth root of Y is not too difficult. If you can make an x^y function, finding the xth root of y is basically doing y^1/x.

As for log, there is a Log function in the Advanced section of the math block. If you want log of any number, use this: log_a x = ln x / ln a. If you prefer to work with log₁₀ instead of ln, it will work as well.

Curious as to how you did the factorial. I'm guessing it was using recursion.

Thanks, but I think the EV3 Log function is only log₁₀ . I'll post the factorial program later.

Edited June 19, 2016 by Technic Jim

[Technic Jim]

Sorry for the double post, but I've figured out a very easy way to do Logarithms using the following formula: log_bx=logx/logb

The fatorial program I made is also uploaded to Bricksafe. The one labelled 'mine' is one I made, and the one labelled 'his' is made by

. The address is http://bricksafe.com/pages/Technic_Jim/lego-calculator#

Cheers for all the help, Jim

[BusterHaus]

Thanks, but what do you mean about the Log function?

Logarithmic expressions are written as X to the power of N. So it's a defined number X to the power of N. Since you already have the exponent function, all you need to do is apply it to the number X.

[Technic Jim]

Logarithmic expressions are written as X to the power of N. So it's a defined number X to the power of N. Since you already have the exponent function, all you need to do is apply it to the number X.

Thanks, but I'll probably use my solution.