How can I prevent MATLAB Coder to generate variable size code for a simple number insertion into a string?
for i=1:4
name=sprintf('Data%d.bin',int8(i));
stuff(name);
end
In the generated C code it uses a lot of functions like emxutil to determine the size of the generated string for sprtintf.
I just want to say that i is only one digit. How can I do that?!
The followings also do not work
name=['Data',char(i),'.bin'];
Using the following also gives an error for generating code that LHS is fixed sized but RHS is varying:
coder.varsize('name',[1,14],[0,0])
I just tested the following again. It works well and also can be used for more digits, and it does not use var size stuff.
name=['Data',int2str(i),'.bin'];
Also, these can be used if we are sure that i is one digit:
['Data' char(48+i) '.bin']
['Data' char('0'+i) '.bin']
Related
I have some complicated array of structures and I want to write it into CSV file. So I need "variable to string" conversion.
Beckhoff as always doesn't care about documentation and their INT_TO_STRING function doesn't work (UNEXPECTED INT_TO_STRING TOKEN when I try to write INT_TO_STRING(20) ).
Moreover their string functions works correctly with only 255 chars.
So I need one of following:
working functions or function blocks or library which allows to convert different types to string
something like sprintf without limitations
some functions to convert between number and ascii char (0x55 is letter 'U') in both directions.
btw. Beckhoff gives us some weird CSV example code, but without data conversion (array has already strings in cells).
Thanks in advance!
I tried to use:
INT_TO_STRING() BYTE_TO_STRING() WHATEVER_TO_STRING()
but it is not working. And there is no clue how many arguments it should have or anything. There is no documentation in Beckhoff information System.
I have different commands my program is reading in (i.e., print, count, min, max, etc.). These words can also include a number at the end of them (i.e., print3, count1, min2, max6, etc.). I'm trying to figure out a way to extract the command and the number so that I can use both in my code.
I'm struggling to figure out a way to find the last element in the string in order to extract it, in Smalltalk.
You didn't told which incarnation of Smalltalk you use, so I will explain what I would do in Pharo, that is the one I'm familiar with.
As someone that is playing with Pharo a few months at most, I can tell you the sheer amount of classes and methods available can feel overpowering at first, but the environment actually makes easy to find things. For example, when you know the exact input and output you want, but doesn't know if a method already exists somewhere, or its name, the Finder actually allow you to search by giving a example. You can open it in the world menu, as shown bellow:
By default it seeks selectors (method names) matching your input terms:
But this default is not what we need right now, so you must change the option in the upper right box to "Examples", and type in the search field a example of the input, followed by the output you want, both separated by a ".". The input example I used was the string 'max6', followed by the desired result, the number 6. Pharo then gives me a list of methods that match that:
To get what would return us the text part, you can make a new search, changing the example output from number 6 to the string 'max':
Fortunately there is several built-in methods matching the description of your problem.
There are more elegant ways, I suppose, but you can make use of the fact that String>>#asNumber only parses the part it can recognize. So you can do
'print31' reversed asNumber asString reversed asNumber
to give you 31. That only works if there actually is a number at the end.
This is one of those cases where we can presume the input data has a specific form, ie, the only numbers appear at the end of the string, and you want all those numbers. In that case it's not too hard to do, really, just:
numText := 'Kalahari78' select: [ :each | each isDigit ].
num := numText asInteger. "78"
To get the rest of the string without the digits, you can just use this:
'Kalahari78' withoutTrailingDigits. "Kalahari"6
As some of the Pharo "OGs" pointed out, you can take a look at the String class (just type CMD-Return, type in String, hit Return) and you will find an amazing number of methods for all kinds of things. Usually you can get some ideas from those. But then there are times when you really just need an answer!
i am trying to print variables with indices.
The goal is to write something like:
x_1 + x_2 = 3 + 1 = 4
The problem is, that variables just like x_1 does not show an index. It shows the underscore itself.
/* works fine */
print(x_1)$
x_1;
/* Does not work */
ostream: make_string_output_stream()$
printf(ostream, string(x_1))$
get_output_stream_string(ostream);
Output of the code above
Converting "x_1" into a string destroys the underscore, but you need a string for the method printf().
Are there workarounds for this?
What to do here probably depends somewhat on what goal you need to achieve with this. Can you say more about the larger goal you are working toward?
In order to generate output which has typesetting instructions in it, you can call the tex or tex1 function to generate TeX output. If that needs to be displayed in a web page, I believe you can make use of the MathJax Javascript library. Sorry, I don't know more about MathJax.
You should probably write x[1] instead of x_1. Displaying x_1 with a subscript 1 is a convenience -- the rest of Maxima doesn't know much about it.
EDIT: There is also an add-on package to output MathML; there might be two such packages, I would have to check. If MathML could help solve your problem, I will look into it.
String a = keyboard.nextLine().ignoreUpperCase()
is this a valid line?
It depends on your intention. The code you shared isn't clear about what you intend to do with the line you are reading from the keyboard.
Like it already has been suggested you could, in Java:
String a = keyboard.nextLine().toLowerCase();
or
String a = keyboard.nextLine().toUpperCase();
The intention here is that all lines you are getting are in upper or lower case. Ok if you want to treat all Strings you read from the keyboard as equals regardless of capitalization.
If your real intention is to match strings regardless of case, then the code reads better as:
String a = "Hello World";
a.equalsIgnoreCase("hello world");
now future maintainers of your code will understand what you're trying to do instead of trying to guess why you are converting to lower/upper case.
I have the following code:
var wqry:TAdoQuery;
...
FillChar(wSpaces,cSpacesAfter,' ');
try
wqry := TADOQuery.Create(nil);//here the error
wqry.Connection:=...
cSpacesAfter is a constant and has the value 1035. wSpaces is a local string variable. The problem is that I receive the following error when TAdoQuery is created
even it is in french, I believe you got the idea.....
If I comment the FillChar code, everything works ok. I have the usual compiler directives, nothing special. I'm using Delphi 7.
Can someone tell me what is wrong with that code?
The troublesome code is most likely this one
FillChar(wSpaces,cSpacesAfter,' ');
I'm assuming that wSpaces is of string type. A string variable is in fact nothing more than a pointer to the data structure that holds the string. You don't need to use pointer syntax because the compiler takes care of that for you.
So what this code does is overwrite the variable holding that pointer with 4 space characters and then write 1031 more spaces over the top of whatever follows the variable. In short you will completely corrupt your memory. That would explain why the FillChar works but the very next line of code dies a painful and dramatic death.
If your string indeed had space for 1035 characters your could instead write:
FillChar(wSpaces[1], cSpacesAfter, ' ');
However, if may be more idiomatic to write:
wSpaces := StringOfChar(' ', cSpacesAfter);
FillChar procedure fills out a section of storage Buffer with the same byte or character FillValue FillCount times.
It is principally used to initialise arrays of numbers. It can be used to initialise records and strings, but care should be used to avoid overwriting length fields. StringOfChar is best for filling out strings to the same character.
Are you sure wSpaces has the size enough to fit all of cSpacesAfter you write to it?