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  1. Add a command for showing a matrix as an image

    It would be nice to be able to show matrices as images where the element values are used as color indices. For image processing, fractals, etc.

    3 votes
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    • Define the basic relationships between units

      Calca doesn't seem to cancel equivalent units. For example 1Watt/1Amp should give me 1V but I end up getting a W/A is it possible to add functionality where the units simplify or is that beyond the scope for the app.

      4 votes
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        1 comment  ·  Admin →
      • Lookup stock prices live

        Would be really useful for calculating portfolio values, IPOs, share purchase programs, etc

        1 vote
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        • Update the Dropbox api so it works on IOS once more

          Dropbox was the key to my using Calca across IOS and Windows, but that fundamentally broke when Dropbox on IOS stopped working (and when Windows 10 didn’t play nice). Now that we have Calca working in Windows 10, would really like to get Dropbox for IOS working again.

          1 vote
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          • Please add support for dB

            I'd love to be able to calculate formulas involving decibels. Would it be possible to implement this feature?

            3 votes
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            • Complete multiplication between a complex scalar and a matrix

              The following calculation is not completed in Calca:

              i*[0,1,2]=> i*[0, 1, 2]

              It should result in [0, i, 2i]

              Expressions involving multiplications between a complex scalar and a matrix will otherwise not be completely simplified.

              Example:

              notzero(x)=if x==0 then 0 else 1

              f(z,c)=z^2+c
              g(c)=
              let initv=c*map(notzero,0..Res) in
              reduce(f, initv)

              f(0, 0.5+i*0.5)=> 0.5i + 0.5
              g(0.5)=> 3.1533
              g(2)=> 2,090,918
              g(0.1)=> 0.1127
              g(0.5i)=> reduce(z^2 + c, 0.5i*[0, 1, 1, 1, 1, 1])

              The last expression can be completely simplified, but Calca stops too soon because of the complex scalar multiplication.

              2 votes
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              • [Mac] Quick entry while in full-screen

                Maybe this will help https://stackoverflow.com/questions/12649279/making-an-application-pop-up-over-a-fullscreen-app

                Apps like Alfred and OmniFocus can bring a mini popup while in full screen. I was wondering if you could do the same with Calca

                Here is a video showing what I mean https://v.usetapes.com/3o1VTPFkII

                3 votes
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                • Add line numbers and allow dynamic reuse of results by line number

                  Soulver lets me type "line1" to use the results of line 1. Would be great to have this in Calca (and to have it track/update the lines if they changed).

                  Otherwise, variable names can get a bit long, and it makes me have to require a variable for _everything_.

                  Maybe you could just implicitly add a function called lineLINENUMBER when no function is defined on a line? Or in addition to it.

                  4 votes
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                  • A small typo in airport plan example

                    “but home many minutes is `0.83`“ should probably be “how many”.

                    1 vote
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                    • 2 votes
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                      • Foot and Inch math using ' and "

                        I use Calca a lot for work, and we do a lot of work with design drawings where distances are specified in a format like 4'-2 1/2". It would be very helpful if Calca could work with lengths written like this for doing math with these lengths.

                        3 votes
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                        • Text Highlights for HTML Comments

                          I open the Calca files in other text editors. I use HTML comments to hide some of the nitty gritty details. Currently, Calca doesn't understand these and marks them as errors. That throws me off when reading/editing them. I think the <!-- --> should just be greyed out. All other text should be normal.

                          1 vote
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                          • Blank screen when launched

                            I often get a blank Calca screen when launched. All the pages are gone. The only way to show the content is the go to the App Store and click Open. It’s getting to the point of not wanting to use it anymore.

                            1 vote
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                            • [bug] keyboard partially visible on iPad 9.7 portrait split screen mode

                              iOS 11: If screen is splitted with another App together with Calca, when trying to input text on Calca screen, the top-part of the added–Calca–keyboard (with symbols, numbers and so on) is only partially visible on Calca’s side of the screen. The other part stays hidden by the other app which shares the screen with Calca. This makes the added part of keyboard unusable occupying precious screen space.

                              2 votes
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                                1 comment  ·  Admin →
                              • Fix currency units in standard library functions

                                Normal units work with library functions; this works:

                                floor(5.46 m) => 5 m

                                But, this does not:

                                floor($5.46) => floor($5.46)

                                I can workaround, by doing something like:

                                add$(x) = $*x
                                rem$(x) = x/$

                                floor$(x) = add$(floor(rem$(x)))

                                Can it be fixed?

                                4 votes
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                                • Sliders to plot functions with a parameter

                                  To have the possibility of add a slider—as in mathstudio or as the manipulate command in mathematica.
                                  For example you want to plot the function
                                  f(x) = sin(a*x)
                                  and you want to see how the graph changes for a in [0,10]
                                  In mathstudio one writes
                                  Slider(a,0..10->0.1,1)
                                  Plot(sin(a*x))
                                  then in the output we get the graph and below a slider that changes the value of a. The initial value is a=1, the increments in a are 0.1, and a changes from 0 to 10. One moves the slider, and the graph of the function changes in real time.
                                  One could add…

                                  1 vote
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                                  • Option to turn off the extra keyboard rows above the standard keyboard

                                    Since the 12.9" iPad already provides a row of number keys, could we have an option to turn off the extra keyboard number rows?

                                    The extra keyboard rows are improperly cropped in split-screen mode anyway, so they just take up valuable screen space.

                                    Thanks!

                                    1 vote
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                                    • Keyboard doesn't fit in portrait mode on 10.5 inch iPad Pro

                                      Hi, the extra keyboard row doesn't display properly when in portrait orientation, it gets both sides chopped off.

                                      -Mike

                                      8 votes
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                                      • Add interpolation functions

                                        I think it would be very nice to have the ability to get, at least, linear interpolation.

                                        1 vote
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                                        • Give Calca some more multilingual support

                                          If Calca presents math into something more tangible, into words that are easier to understand, Calca should support multiple languages outside of English. Maybe Chinese support for instance.

                                          4 votes
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