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  1. Normal and inverse normal probability

    Approximation of F(z) from z
    For a given z, to find F(z), the following Hastings routine

    #entrar el valor de z para el qye se desea encontrar Prob[x<=z]

    z=-1.88

    Valor de z
    k= if z < 0 then -z else z
    d1=0.0498673470
    d2=0.0211410061
    d3=0.0032776263
    d4=0.0000380036
    d5=0.0000488906
    d6=0.0000053830

    F(z)=1−0.5*(1+d1*k+d2*k^2+d3*k^3+d4*k^4+d5*k^5+d6*k^6)^(-16)

    Prob= if z < 0 then 1-F(z) else F(z)
    Prob=> 0.0301

    Aproximation of z from F(z)

    c0=2.515517
    c1=0.802853
    c2=0.010328
    cd1=1.432788
    cd2=0.189269
    cd3=0.001308

    x=0.0301

    #entrar el valor de P[x<=k] en H
    H=0.95

    H1= if H<=0.5 then H else 1-H

    t=sqrt(ln(1/H1^2))

    k=t-(c0+c1*t+c2*t^2)/(1+cd1*t+cd2*t^2+cd3*t^3)

    zinv= if H1<=0.5 then k else -k

    zinv => 1.6452

    1 vote
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    • Make it work with Bear/ DayOne both support markdown

      Calca concept is brilliant as was looking for something like that for long time. It would be super nice if i could easily export the notes from calca to Bear and / or Day One.

      3 votes
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      • Derivating twice and plotting glitch

        When trying to derivate like this:
        f= x^3 + 4x^2 - 5x + 1
        der(f(x),x)=h
        der(der(f(x),x),x) = j
        f => x^3 + 4 x^2 - 5 x + 1
        h => 3 x^2 + 8 x - 5
        j => 6 x + 8
        plot (f,j,h, -5..5)

        The h function won't plot.
        Tried unnesting the derivations as well but it not help.
        Please fix this.
        Great program by the way!

        3 votes
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          1 comment  ·  Admin →
        • More reactive variables =>

          Plot in the note
          Plot MathJax in the note
          Plot and calculation interacts with variables in a transparent non editable mode.
          iOS : Interactions on variable don't work …
          more réactives interactions possibilities with ForceTouch

          1 vote
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          • Fonction composition f°f

            Fonction composition
            f ° f (t) === f(f(t))

            1 vote
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            • Higher derivatives

              Higher derivatives
              der^2 (f (t) ) === der(der( f ) , t))

              1 vote
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              • Make Calca grammar explicit

                Calca syntax grammar sugar

                2 votes
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                • i liked your finance example, but if there could be a way to tag each item and get tag based summary it will be great

                  say

                  expense +=
                  bike repair(p1) = 1000
                  house(p0) = 100
                  car fixing(p1) = 9000
                  window(p0) = 200

                  expense => ...

                  and p0 => should be sum of all p0
                  p1 => should be sum of all p1

                  1 vote
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                  • i liked your finance example, but if there could be a way to tag each item and get tag based summary it will be great

                    say

                    expense +=
                    bike repair(p1) = 1000
                    house(p0) = 100
                    car fixing(p1) = 9000
                    window(p0) = 200

                    expense => ...

                    and p0 => should be sum of all p0
                    p1 => should be sum of all p1

                    1 vote
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                    • Create a video tutorial.

                      Having a video tutorial on the site would allow for users to quickly grasp the flow of the app. As I come from a CS background I am drawing similarities with Calca and typical programming and with the obvious differences between Calca and typical programming I am running into issues ramming heads with my 'common sense'

                      Thanks for listening

                      6 votes
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                      • Support for TODAY Function

                        It would be nice to support the following examples (let's suppose Today's date is 10/30/2016

                        TODAY - 3 DAYS => 10/27/2016
                        TODAY - 1 MONTH => 09/27/2016

                        6 votes
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                        • Render matrix calculation results

                          Whenever the result of a calculation is a matrix, show it in tabular view, not just as a vector of vectors — either inline, or in the plot view.

                          4 votes
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                          • Let's thank the dev!

                            Good job with your app. Thanks for being awesome with your continued support and feedback.

                            3 votes
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                            • Adding onto the value stored in variables

                              Having the ability to add to the value in a variable would be helpful. As I come from a CS background that was one of my first thoughts when picking up this app.

                              One of the first things I tried to use this app for was keeping scores for a project I was working on. I defined some 'variables' assigned a value, then tried to update the value using an incrementer. Since it didn't work I am suggesting that here.
                              EX.
                              ChangingVar = 0
                              ChangingVar +1 //or something to that effect
                              ChangingVar = 1

                              1 vote
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                              • Create a plugin/module/extensibility/customization framework.

                                Because google's search engine is not the top of the line for scientific or technical or knowledge-based calculations. To that effect I would love if WolframAlpha's knowledge computation engine (URL = hhtp://www.wolframalpa.com) or MathWorld hosted on wolfram.com's servers (URL = http://mathworld.wolfram.com) couldbe included in calca's information lookup function. As well if the user has private well-structured local databases an API could be provided to query said information.

                                5 votes
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                                • Your app in the list

                                  My name is Artem, founder of freeappsforme.com

                                  We've reviewed your "Calca" app and put it in 20 Best Calculator apps for iPhone & Android:

                                  http://freeappsforme.com/calculator-apps-iphone-android/

                                  If you have a "mentions" page somewhere - we will be pleased to get a link to this post.

                                  Thanks

                                  1 vote
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                                  • IOS support for two finger zoom/shrink in place of A^ or down button

                                    I am so used to zooming/shrinking content on IOS applications, that I find it strange the IOS app does not support this functionality and instead I have to click the buttons to the top right of the application screen.

                                    It is much better for users if applications follow the UI conventions of the device being used.

                                    1 vote
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                                    • Dropbox sync

                                      Sometimes after I made a small change to a file and open it again, the change didn't get saved. The file was stored in dropbox. How could this happen?

                                      5 votes
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                                      • 8 votes
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                                        • I really would like to have the possibility to use ownCloud.

                                          Many people use ownCloud for many reasons. Cheaper, privat cloud storage at home is always preferable if you have something like that.

                                          1 vote
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