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File:  [LON-CAPA] / loncom / homework / templates / Rnumerical.problem
Revision 1.3: download - view: text, annotated - select for diffs
Mon Jul 6 17:12:47 2009 UTC (15 years, 7 months ago) by bisitz
Branches: MAIN
CVS tags: version_2_9_99_0, version_2_12_X, version_2_11_X, version_2_11_6_msu, version_2_11_6, version_2_11_5_msu, version_2_11_5, version_2_11_4_uiuc, version_2_11_4_msu, version_2_11_4, version_2_11_3_uiuc, version_2_11_3_msu, version_2_11_3, version_2_11_2_uiuc, version_2_11_2_msu, version_2_11_2_educog, version_2_11_2, version_2_11_1, version_2_11_0_RC3, version_2_11_0_RC2, version_2_11_0_RC1, version_2_11_0, version_2_10_X, version_2_10_1, version_2_10_0_RC2, version_2_10_0_RC1, version_2_10_0, loncapaMITrelate_1, language_hyphenation_merge, language_hyphenation, bz6209-base, bz6209, bz2851, PRINT_INCOMPLETE_base, PRINT_INCOMPLETE, HEAD, GCI_3, BZ4492-merge, BZ4492-feature_horizontal_radioresponse, BZ4492-feature_Support_horizontal_radioresponse, BZ4492-Support_horizontal_radioresponse
Consistent problem templates:
- New line after each tag (not for texts in foils)
- One empty row after each end tag and before new start tag for second level tags
- No indentation for second level tags, e.g. <script>
- Four white spaces as indentation for each further sub level
    Exceptions:
        -Content (mostly text) in separate line(s): no indentation
        - Concept groups: same indentation as foilgroup
          (allows to insert code from problems without concept groups without changing the indentation and vice versa)
- No new line at end of template
- Removed new lines from within the middle of default texts
- Added one blank each after "<m>$" and before "$</m>" to ensure no misinterpretation neither by human nor by machine (e.g. "<m>$x" is not "<m>$ $x")
- Replaced deprecated font tag in <instructorcomment> by CSS
- Removed dos line endings
- dos2unix conversion
  (ClickImageExample.problem, RandomLabelExample.problem, SimpleMatching.problem)

    1: <problem>
    2: 
    3: <script type="loncapa/perl">
    4: $seed=&random(1,500,1);
    5: $n=&random(15,25,1);
    6: $offset=&random(2,5,0.1);
    7: $slope=&random(0.6,2.5,0.1);
    8: # construct a data set using R
    9: # dump is for debugging, print to screen to see data structure
   10: ($data,$dump)=&cas_hashref('R',"set.seed($seed);x<-1:$n;w<-1+sqrt(x)/2;data.frame(x=x,y=$offset+$slope*x+rnorm(x)*w);");
   11: @x=&cas_hashref_array($data,'x');
   12: @y=&cas_hashref_array($data,'y');
   13: $datax=join(',',@x);
   14: $datay=join(',',@y);
   15: # calculate the right answer using R
   16: ($answerdata,$dump)=&cas_hashref('R',"x<-c($datax);y<-c($datay);dataset<-data.frame(x=x,y=y);fm<-lm(y~x,data=dataset);");
   17: $answer=&cas_hashref_entry($answerdata,'coefficients','x').'*x+'.&cas_hashref_entry($answerdata,'coefficients','(Intercept)');
   18: </script>
   19: 
   20: <startouttext />
   21: Consider the plotted data set.<br />
   22: <endouttext />
   23: 
   24: <gnuplot width="400" solid="0" plotcolor="monochrome" gridlayer="off" bmargin="default" font="9" alttag="dynamically generated plot" bgcolor="xffffff" texfont="22" transparent="off" plottype="Cartesian" rmargin="default" gridtype="Cartesian" minor_ticscale="0.5" fontface="sans-serif" grid="on" align="left" texwidth="93" height="300" border="on" samples="100" fgcolor="x000000" major_ticscale="1" tmargin="default" lmargin="default" fillstyle="empty">
   25:     <curve linestyle="points" linetype="solid" color="x000000" pointtype="3" limit="closed" pointsize="2" linewidth="1">
   26:         <data>@x</data>
   27:         <data>@y</data>
   28:     </curve>
   29: </gnuplot>
   30: 
   31: <startouttext />
   32: <br />
   33: Give a linear function approximating the data.<br />
   34: <tt>y(x)=</tt>
   35: <endouttext />
   36: 
   37: <formularesponse id="11" answer="$answer" samples="x@1:$n#20">
   38:     <responseparam name="tol" default="2%" description="Numerical Tolerance" type="tolerance" />
   39:     <textline size="25" readonly="no" />
   40: </formularesponse>
   41: 
   42: </problem>
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