In addition to the incomplete gamma function I am planning to add a
series of other special functions useful for statistical calculations,
among them the incomplete beta function and its inverse.
Calculation of the inverse incomplete beta function usually is performed
in the literature by
Am 04.04.2017 um 03:28 schrieb Marco van de Voort:
Did you test performance? Repeated access to parent frame in tight loops
might be suboptimal. Could maybe be helped with some pointer work?
Right, I should have done that before asking...
Here are the results of a test running the original
Does anybody know how to write mathematical expressions in the wiki? I
would like to write an article on fpc's NumLib, but I would only want to
begin this activity when I know how to enter complex mathematical
formulas like integrals etc such that they are displayed decently.
Am 15.04.2017 um 18:59 schrieb Denis Kozlov:
I think you have 2 options:
1) Write your formulates using the wiki's standard notation
LaTeX, and once a Math extension is installed (if ever),
your formulas will be automatically rendered.
2) Generate visual rendering of your LaTeX formulates
Am 14.04.2017 um 14:49 schrieb ListMember:
Apparently, the FPC wiki uses the same software as Wikipedia; if so,
the following links may be useful.
https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Mathematics#Using_HTML
https://en.wikipedia.org/wiki/Wikipedia:Mathematical_symbols
Am 18.04.2017 um 13:07 schrieb Marco van de Voort:
Note that there is documentation, it is just Dutch and TeX (not latex but
straight tex). Also, for some units the documentation sources are older than
the pascal source.
I know this source, I think you once had posted it in the German forum.
d with
$DEFINE RUNTIME_ERRORS, terminates the program like before with a
RunError(ErrCode).
Am 14.03.2017 um 09:58 schrieb Marco van de Voort:
In our previous episode, Werner Pamler said:
is no way to check whether a value is "equal" to NaN. In math, however,
there is a function IsNaN
Hi everybody - my first post here...
At the moment I am spending some time with fpc's numlib and writing a
wrapper for a more versatile fitting procedure. Are there any problems
to add the unit math to the uses clause of some numlib units? I want to
use the value NaN (not-a-number) which is
Am 14.04.2017 um 19:33 schrieb Giuliano Colla:
Hope that it helps.
Not really... What I was seeking is a working example for something like
\sum_{n=0}^\infty \frac{x^n}{n!}
My naive assumption is that I'd just have to type this phrase into the
wiki text to get this formula in perfect math
Am 18.04.2017 um 21:42 schrieb Vincent Snijders:
I installed this extension with the default settings for size. See
http://wiki.lazarus.freepascal.org/SANDBOX#Math.
Thank you. Works fine in Chrome, but when I open this page in Firefox I
don't see the formula, only the header "Math" :-(
Am 18.04.2017 um 23:24 schrieb Tomas Hajny:
Which Firefox version? SeaMonkey shows it correctly (Mozilla/5.0 (Windows
NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46)...
OK - found it: I have NoScript installed; if I remove the restrictions
from the site the formulas show
Am 18.04.2017 um 23:24 schrieb Tomas Hajny:
On Tue, April 18, 2017 23:16, Werner Pamler wrote:
Am 18.04.2017 um 21:42 schrieb Vincent Snijders:
I installed this extension with the default settings for size. See
http://wiki.lazarus.freepascal.org/SANDBOX#Math.
Thank you. Works fine in Chrome
Here is a little demo program which uses fphttpclient to download some
file from some server.
If the URL exists everything is fine (note on Windows, that the OpenSSL
dlls must be copied to the exe directory for the demo to work). If the
URL does not exist, but the server responds, the program
Agreed. This is the same situation as with string-to-number conversion:
StrToFloat fires an exception if the string is not a valid float, but
there's also a "TryStrToFloat" which by-passes the exception and just
returns a false in case of an error. Why not having something like a
"TryGet"
Another, related topic would be: Replacement of HTML entities, e.g.
convert a string such as 'cmsup2/sup' to
'cm2', or 'sin + cos ' to the one with the
correct greek symbols (utf8). I have a solution in TAChart, unit TAHtml,
but maybe (probably...) there's a better one.
Am 23.07.2017 um 18:09 schrieb Michael Van Canneyt:
This exists:
function ResolveHTMLEntityReference(const Name: WideString; var
Entity: WideChar): Boolean;
is in unit htmldefs, fcl-xml package.
Thank you. Seeking more carefully would have saved me a lot of tedious
typing... Replaced my
Am 23.12.2017 um 13:24 schrieb Anton Shepelev:
Hello, all
May I ask you if there is any chance of fixing the
error in the Math unit that I reported here:
https://bugs.freepascal.org/view.php?id=32804
and provided a patch? Here is a test case:
Program Vartest;
uses Math;
const Size =
Am 12.01.2018 um 00:27 schrieb Bart:
Does it (D Starter) behave "nice" alongside fpc?
I have the Starter 10.1 and 10.2 running on the same machine which has
also several Lazarus/fpc versions. No problems, except for scripts
because Delphi merges itself into the system path so that the fpc
Am 30.01.2018 um 22:40 schrieb Florian Klämpfl:
Am 29.01.2018 um 21:11 schrieb Russell Davies:
Hi,
Just curious, does the use of SHGetKnownFolderPath() in trunk package
winunits-base in fpttf.pp mean
the end of Windows XP support as this function is not available in XP's
shell32.dll
Am 15.01.2019 um 18:08 schrieb Werner Pamler:
Trying to build laz trunk (r60090) with fpc fixes (r40840) fails in
(lazarus)\trunk\components\fppkg\src\fppkg_packagevariant.pas,
function TFppkgNamedItemList.FindItemByName, lint 95 ("Result := nil")
with the error "fppkg_packageva
Trying to build laz trunk (r60090) with fpc fixes (r40840) fails in
(lazarus)\trunk\components\fppkg\src\fppkg_packagevariant.pas, function
TFppkgNamedItemList.FindItemByName, lint 95 ("Result := nil") with the
error "fppkg_packagevariant.pas(95,13) Error: Incompatible types: got
"Pointer"
FPC trunk has not been very friendly to existing code recently...
Today with r40792, the TAChart package fails to recompile:
"tadiagram.pas(347,38) Error: Only static methods and static variables
can be referenced through an object type". The faulty code is
operator = (const A, B:
Am 07.01.2019 um 17:13 schrieb Sven Barth via fpc-devel:
Did you try to add "static" to the TDiaPosition.Equals class function?
For an object type only instance and static class methods make sense
so non static class methods should probably best be forbidden.
That did the trick. Thank you.
Am 28.09.2019 um 19:03 schrieb Michael Van Canneyt:
AShape.
should do the trick, no ?
Yes, thanks.
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I am porting an older Delphi project to Lazarus/FPC which analyzes the
internal structure of PowerPoint files using OLE automation. While the
overall program is working I am stuck with some OLE properties which
have the name of Pascal keywords, e.g. Shape.*Type *or ColorEffect.*To*.
FPC 3.0.4
Some time ago I wrote a wiki article on our NumLib
(https://wiki.lazarus.freepascal.org/NumLib_Documentation). Looking at
this page again today I found that the math expressions are no longer
rendered correctly by Firefox, it just displays the MathML source text,
e.g.
Thanks to all who answered. Since nobody could reproduce the Firefox
issue with the MathML expression I switched to the default Firefox
profile and - alas - the expressions were rendered correctly. Therefore,
I somehow must have screwed up my Firefox profile settings. Need to
investigate on
Am 02.01.2020 um 20:10 schrieb Ondrej Pokorny:
TStrings.SaveTo*() writes BOM by default. Formerly the BOM was not
written.
There is also the problem that currently it is not possible, without
further action, to retain the BOM state of a file loaded into a
stringlist, modified and written
Am 01.01.2020 um 17:01 schrieb Ondrej Pokorny:
Isn't the TStrings.WriteBOM property good enough? Why to have yet
another not-very-useful overload?
To be honest I think Bart's idea of making the BOM an optional parameter
of the Save methods appears to me more efficient than defining a
Am 02.01.2020 um 00:51 schrieb Ondrej Pokorny:
The WriteBOM property has a valid purpose - it is set in LoadFrom*
according to the BOM presence in the loaded file. I.e. if you do:
MyStrings.LoadFromFile('abc'); // WriteBOM and Encoding properties are
set here
MyStrings.SaveToFile('abc'); //
Am 02.01.2020 um 00:51 schrieb Ondrej Pokorny:
The WriteBOM property has a valid purpose - it is set in LoadFrom*
according to the BOM presence in the loaded file. I.e. if you do:
MyStrings.LoadFromFile('abc'); // WriteBOM and Encoding properties are
set here
MyStrings.SaveToFile('abc'); //
Am 25.07.2020 um 20:40 schrieb J. Gareth Moreton:
I'm having problems in that the latest Lazarus trunk won't create a
console window when I'm running the compiler source in the debugger.
I have the same issue. A simple CLI program like
program Project1;
begin
WriteLn('Test');
ReadLn;
I am having issues in the nogui demo of TAChart with FPC 3.2.0. It uses
the FCL unit ftfont and crashes at runtime with
Project noguidemo.exe raised exception class 'EInOutError' with
message:
Can not load Freetype library "freetype.dll". Check your installation.
This does not happen
Am 17.07.2020 um 17:26 schrieb Michael Van Canneyt:
It is exactly the opposite.
It can now load the DLL dynamically.
home:~/fpc/packages/fcl-image/src> svn log freetypeh.pp
r37865 | michael | 2017-12-29 15:22:33 +0100
Am 17.07.2020 um 12:30 schrieb Ondrej Pokorny:
I am not 100% sure, but some freetype.dll versions can depend on
zlib1.dll. I.e. you need to copy zlib1.dll to the exe directory as well.
Actually I just found an info about it:
https://wiki.freepascal.org/FPReport_FAQ (see Lazarus does not start
Am 17.07.2020 um 23:29 schrieb Michael Van Canneyt via fpc-devel:
First you'll have to explain something:
Why does it break existing code according to you ?
The default library name is the same in both units.
Compile and run the noguidemo in the Lazarus folder
components/tachart/demo/nogui. It
Am 27.07.2020 um 12:57 schrieb Pascal Riekenberg:
Are you sure? I use laz trunk and fpc trunk and for me the issue arises when
run within the IDE without debugging. This also applies to Windows apps with
option -WC.
Strange... But I checked it again (with the simple WriteLn program
above)
Am 05.01.2021 um 08:55 schrieb Pascal Riekenberg via fpc-devel:
Since i updated my local fpc trunk some of my programs do not compile
anymore. Version from before christmas was okay.
The compiler can't find the function "IfThen(AValue: Boolean; const
ATrue: string; const AFalse: string):
A happy, successful and healthy New Year to everybody!
I have a generics related compilation issue in my package ExCtrls
package
(https://sourceforge.net/p/lazarus-ccr/svn/HEAD/tree/components/exctrls/).
This package contains a TCurrencySpinEditEx component which inherits
from the
I am using the following script to build a debug version of FPC-main on
Windows:
set BINUTILS_DIR=C:\Lazarus\fpc_bootstrap_compiler\3.2.2\i386-win32
set BOOTSTRAP_COMPILER=%BINUTILS_DIR%\ppc386.exe
set FPC_DEST_DIR=c:\Lazarus\fpc-main
set BIN_DIR=bin\i386-win32
set
Am 23.08.2021 um 11:52 schrieb Bart via fpc-devel:
Does anybody have a common.dll in \windows\system32 at all?
I don't have it, neither in system32 nor in SysWOW64.
Just pulled the current revision of fpc-trunk, and did not observe this
error (Win 10, fpc3.2.2 32-bit bootstrap compiler)
Am 23.08.2021 um 18:14 schrieb Marco van de Voort via fpc-devel:
[...] I notice is that you point lazarus to the ppu's in the FPC
source tree [...]
Sorry, I don't understand: There is no Lazarus involved in my build
script. If there is, show me the line and how you would modify it.
Am 25.08.2021 um 20:53 schrieb Marco van de Voort via fpc-devel:
Sorry. I'm on holiday, and I only check in occasionally at night. Try
changing PP= to FPC=
Thank you, Marco. Now I did already the second successful build of a
older clone after an update. This really was the solution. But what is
Am 23.08.2021 um 14:06 schrieb Marco van de Voort via fpc-devel:
Op 8/23/2021 om 1:36 PM schreef Werner Pamler via fpc-devel:
make install all OPT=%OPTIONS% INSTALL_PREFIX=%FPC_DEST_DIR%
PP=%BOOTSTRAP_COMPILER%
Shouldn't this (install all) be the other way around? Classically one
builds
https://forum.lazarus.freepascal.org/index.php/topic,57621.msg428799.html#msg428799
--> the issue occured already on Dec 24.
https://forum.lazarus.freepascal.org/index.php/topic,57611.msg428693.html#msg428693
--> the issue did not yet exist on Dec 23.
Am 18.09.2022 um 14:04 schrieb Bart via fpc-devel:
Werner reported that it does not compile on MacOS (64 bit) with fpc 3.3.1.
Sorry if I was not precise here: I only tested with fpc 3.2.0.
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Am 01.04.2024 um 16:19 schrieb Marco van de Voort via fpc-devel:
Op 01/04/2024 om 12:30 schreef Werner Pamler via fpc-devel:
Am 31.03.2024 um 11:55 schrieb Pascal Pype via fpc-devel:
There seems to be a bug in the TDateTime data type. When the time
difference between two TDateTime variables
Am 31.03.2024 um 11:55 schrieb Pascal Pype via fpc-devel:
There seems to be a bug in the TDateTime data type. When the time
difference between two TDateTime variables is just one millisecond, the
compareDateTime function returns 0 (equality) rather than the expected
-1 or 1 (different).
It is
Am 01.04.2024 um 16:19 schrieb Marco van de Voort via fpc-devel:
Op 01/04/2024 om 12:30 schreef Werner Pamler via fpc-devel:
Am 31.03.2024 um 11:55 schrieb Pascal Pype via fpc-devel:
There seems to be a bug in the TDateTime data type. When the time
difference between two TDateTime variables
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