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TOPIC: Expression Manager: Nested Equations?

Expression Manager: Nested Equations? 3 years 1 month ago #90521

  • Mazi
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Fred wrote:
Maybe in a future version all this masking and formatting will be baked in and a lot easier to use.
At Limesurvey 2.1 there will also be a thousand separator available. So when you set the decimal separator to "." (US number format), the thousands separator will automatically be set to "," and vice versa.

This is implemented for the numeric question types to make large numbers easier to read when inputting them.
I'm not sure if this might cause any conflicts e. g. when using EM because only the number display is adjusted while the actual storing of the value should not have changed, but if someone notices any problems, please file a bug report and post the link to the report here.

Best regards/Beste Grüße,
Dr. Marcel Minke
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Contact: marcel.minke(at)limesurvey.org'"
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Expression Manager: Nested Equations? 3 years 1 month ago #90523

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Mazi wrote
At Limesurvey 2.1 there will also be a thousand separator available. So when you set the decimal separator to "." (US number format), the thousands separator will automatically be set to "," and vice versa.

Yes, Denis told me a little about that. Hopefully it will work on Inputs so we don't have to do all this custom JS masking. And it can work equivalently in Expressions just for display but without saving to the database. It would be nice if we could get prefix/suffix into Equations somehow as well. I use them for $ and % signs.

This business of having to create two questions for everything is not very user-friendly for typical survey creator

What is the roadmap for 2.1 anyway? I keep hearing about it, but there's not much on the site. Maybe this could use an update :)
docs.limesurvey.org/LimeSurvey+roadmap&highlight=2.1
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Aw: Re: Expression Manager: Nested Equations? 3 years 1 month ago #90524

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Fred wrote:
This business of having to create two questions for everything is not very user-friendly for typical survey creator

What is the roadmap for 2.1 anyway? I keep hearing about it, but there's not much on the site. Maybe this could use an update :)
docs.limesurvey.org/LimeSurvey+roadmap&highlight=2.1

I totally agree that the two question solution is not the best case, but most surveys are not that complex and thus you can use the assessment feature for most of the simple stuff.

Nevertheless, if you have a good idea on how we can easily mass-add equations to Limesurvey questions, please write a proposal we can discuss.

As for the roadmap: A first Limesurvey 2.1 alpha release is planned for end of January. As so often, my guess would be that it will be February for a first version and maybe April/May for the stable release (just guessing).

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Aw: Expression Manager: Nested Equations? 3 years 1 month ago #90526

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Yes, not the best.. BUT it does work! (Thank you Tom)

Mazi, if you click on my karma button so that it will finally go above zero, then I will think about this equations issue!
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Aw: Expression Manager: Nested Equations? 3 years 1 month ago #90527

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:-)

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Expression Manager: Nested Equations? 3 years 1 month ago #90558

  • DenisChenu
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Mazi wrote:
This is implemented for the numeric question types to make large numbers easier to read when inputting them.
Hello Marcel,

I look at 2.1 code, and don't see this system, and EM function are var numRegex = new RegExp('[^-' + LEMradix + '0-9]','g'); : no thousand seperator here .

Are you sure it's in 2.1 actually ?

Denis
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Expression Manager: Nested Equations? 3 years 1 month ago #90563

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Hi Denis,

this should be in 2.1 already. Please contact Sam about the details, he has coded that.

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Expression Manager: Nested Equations? 3 years 3 weeks ago #91266

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A follow up to one of my earlier comments. I said a couple of weeks ago...
This survey actually has over 500 of these equations, and now we are doubling the number of questions. Although the display questions don't create a column in the survey_NNN table at least. It's a good thing I am using Excel and your awesome Excel importer to create all the questions.

Actually I discovered that LS actually DOES create a column in the survey responses table for Text Display (Boilerplate) questions. This may have been introduced between 1.91 and 1.92 according to Denis? It's only varchar(1) so fortunately it doesn't take up too much room. But if you have a large survey, you may want to factor this into your estimates:
docs.limesurvey.org/General+FAQ#regarding_survey_size

It does seem a little silly to have all these empty columns in the responses. Usually sparseness is a quality you want to avoid in DB. But if Thomas White did this, I'm sure there was an excellent reason!
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Expression Manager: Nested Equations? 3 years 3 weeks ago #91267

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As far as I remember, 1.91 did also create a varchar(1) for each boilerplate question even though it could never contain anything. I left it in for backwards compatability.

However, I'd vote to remove those columns in version 2.1

/Tom
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Expression Manager: Nested Equations? 3 years 3 weeks ago #91269

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Fortunately, for the big survey I was working on, even with the extra overhead of many text display questions for equation formatting, everything worked out great so far.

I built everything in Excel, coding all the expressions using Excel formulas, concatenate, etc. There are probably 1000 expressions including equations and relevance. This took a few weeks. Then I imported it using the Tab-delimited Text import utility. The import and table build took about 2 seconds and worked perfectly. And I can run through the survey without crashing, too :)

There is absolutely no way this could have been done without Expression Manager and the Text importer!

1744 rows in text import file
1558 columns in Survey_NNN table
Question groups: 35
Questions: 1494
Answers: 102
Subquestions: 60
Question attributes: 4145

The MySQL table schema has this data, but I'm not sure how to interpret. The data length sounds too little and the max length sounds too big?

AVG_ROW_LENGTH 2468
DATA_LENGTH 2468
MAX_DATA_LENGTH 281,474,976,710,655
INDEX_LENGTH 12288
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Expression Manager: Nested Equations? 3 years 3 weeks ago #91272

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TMSWhite wrote:
As far as I remember, 1.91 did also create a varchar(1) for each boilerplate question even though it could never contain anything. I left it in for backwards compatability.

However, I'd vote to remove those columns in version 2.1

/Tom
I rememeber some time when boilerplate question type doesn't create a column, maybe in 1.87 then ???

2.0 still create a column. And like Thomas: vote to "don't add it".
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Expression Manager: Nested Equations? 3 years 3 weeks ago #91278

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Thanks for your valuable feedback, Fred.

It's nice to hear that EM can handle that large amount of data and expressions and that the Excel import works so great.

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Expression Manager: Nested Equations? 3 years 2 weeks ago #91716

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I think there may be a bug in Expression Manager number_format. If you have an equation with result is a number greater than minus1000 or less than 1000, and try to number_format () it displays NAN. So any 1, 2, or 3-digit positive or negative and I get the NAN.

(I would report a bug but my account never works on the bugs site)

Funny I came across this php bug discussion about PHP number_format where Rasmus himself comments and gets in an argument with users
bugs.php.net/bug.php?id=50696
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Expression Manager: Nested Equations? 3 years 2 weeks ago #91722

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A very "interesting" discussion at the PHP Bugtracker...

Fred, can you attach a sample survey? I'm not sure how this is implemented in detail at the EM but would like to test before submitting a ticket. Maybe the code is handled by PHP after being parsed by EM and thus the PHP bug causes the problem (just guessing))?!

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Expression Manager: Nested Equations? 3 years 2 weeks ago #91740

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It's not a number_format (not really).

number_format(10) return 10.

But if you do :
"some text"+number_format(10) : EM test if ("some text" AND number_format(10)) are string. And seems number_format(10) are not a string.

Think EM must do this:

10+10 = 20
"some text"+10 = "some text10".

And have a solution to do:
"10"+"10"="1010"

ACtually, EM test is strval(floatval("10"))=="10" and put is numeric if yes: think there are a conceptual bug here.

Denis
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