Databases
StackOverflow2013
Postsdbo
POtranslating loop from Fortran to MATLAB
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POtranslating loop from Fortran to MATLAB
    primarykey
    data
    text
    <p>I'm currently translating code from Fortran to MATLAB manually, and I am unsure of how to translate part of it. (The entire code actually is a 2,000 line subroutine.) The code is below.</p> <pre><code>C Has series crossed neckline? 120 neckext=x(trough(peaknum-1))+ * dydx*real((t-trough(peaknum-1))) if(x(t).lt.neckext) goto 130 C NO. Here if series has not crossed neckline, nor new trough found C Check to see if new trough has been found. t=t+1 if(t.ge.lastobs) goto 900 if(x(t).lt.min) then min=x(t) mindate=t end if troughid=min*(1.0+cutoff) if(x(t).ge.troughid) goto 150 goto 120 C YES. Here if series crossed neckline before new trough found 130 dblcount=0 if(poscount.ge.1) then DO 132 i=1,poscount if((enterdt(i)-2.le.t).and.(t.le.enterdt(i)+2)) then dblcount=dblcount+1 end if 132 continue if(dblcount.ge.1) then C write(30,2583) t,Cutnum 2583 format('DoubleCounting episode occurred at ',I5, * ' with Cutoff = ',F3.1) goto 150 end if end if </code></pre> <p>My problem is with this part of the code:</p> <pre><code> if(x(t).ge.troughid) goto 150 goto 120 </code></pre> <p>When I was translating this part in MATLAB, I was writing something like:</p> <pre><code>if x(t,:)&gt;=troughid t=marker; minimum=x(t,:); end </code></pre> <p>But I don't know what to do with the label 120. When I translate it, do I write that part again? Because from what I understand, when I go back to 120, the code will be running again. Thanks!</p> <p>EDIT: As a response to Chris's question on what labels 150 and 900 do, I'll post them here.</p> <pre><code>150 t=marker min=x(t) </code></pre> <p>And this is for the label 900.</p> <pre><code>C Last observation found. This iteration finished. 900 continue </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USJulio Galvez
    1. USJulio Galvez
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COAnd they say `goto`s make code hard to follow !
      singulars
      1. POtranslating loop from Fortran to MATLAB
      1. USHigh Performance Mark
    2. CO@HighPerformanceMark It's true. So true. On the other hand, how many other languages have vast amounts of battle-hardened numerical code? I suppose that's a tribute to both the utter simplicity of F66/F77 and forty years of graduate students shedding blood, dignity, and tears.
      singulars
      1. POtranslating loop from Fortran to MATLAB
      1. USsfstewman
    3. COIf you haven't done so, it's worth developing some comprehensive (and ideally automated) tests to make sure that your port actually reproduces the original behavior. This kind of work is tedious and error-prone. A good test suite can save you tremendous amounts of time and frustration, especially if this code is important to some greater and more complicated goal.
      singulars
      1. POtranslating loop from Fortran to MATLAB
      1. USsfstewman
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload