Help with basic MATLAB syntax

[EDIT: Jun. 14, 17:42:47 UTC - Reformat MKF]

how i write this in matlab

sin(cos(eln25))+100(55/7-1000tan(.23))

[Walter Roberson]

What does eln25 mean?

Is the 0.23 intended to be degrees or radians?

[Walter Roberson]

55/7 is an approximation of 2*pi . That suggests to me that perhaps your tan expression is intended to be an arctan expression ?

Answer 1

[Matt Fig]

sin(cos(eln25))+100*(55/7-1000*tan(.23))

Assuming eln25 is a variable with numerical value, or a function which returns a number.

[Sean de Wolski]

I would guess he mean exp(1)*log(25)

[Walter Roberson]

I'm thinking zizo might mean exp(log(25)). Hard to say.

[Sean de Wolski]

@Walter: wouldn't that just be 25?

[Walter Roberson]

Sure, but the challenge might be to learn how to code it anyhow. After all the entire expression is constant and could be replaced by a single number.

[Sean de Wolski]

Very true. I'll get back to doodling :)

Answer 2

[Matt Tearle]

Just for Sean:

function doodle

hf = figure;
ha = axes('units','normalized','position',[0,0,1,1],...
        'XLim',[0,1],'XTick',[],'YLim',[0,1],'YTick',[]);

set(hf,'WindowButtonDownFcn',@startdraw)
uiwait(hf)

      function startdraw(src,~)
          set(src,'pointer','crosshair')
          cp = get(ha,'CurrentPoint');
          xinit = cp(1,1); yinit = cp(1,2);
          hl = line('XData',xinit,'YData',yinit,...
              'color','k','linewidth',2);
          set(src,'WindowButtonMotionFcn',@movedraw)
          set(src,'WindowButtonUpFcn',@enddraw)

          function movedraw(~,~)
              cp = get(ha,'CurrentPoint');
              xdat = [get(hl,'XData'),cp(1,1)];
              ydat = [get(hl,'YData'),cp(1,2)];
              set(hl,'XData',xdat,'YData',ydat);
              drawnow
          end

          function enddraw(src,~)
              set(src,'Pointer','arrow')
              set(src,'WindowButtonMotionFcn',[])
              set(src,'WindowButtonUpFcn',[])
              uiresume(hf)
          end
      end

end

Answer 3

[Sean de Wolski]

1. Open the editor and a new blank file or the command line
2. Copy the above into it

That will have then been written in MATLAB!