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I want to compare 2 plots, and view that 4 lines are exactly the same tangent.

So I would like to view 2 images with the same scale in the y-axis and the same scale in the x-axis

How can I do this. AspectRatio it´s not a solution for me becasue is a ratio for the image not for the scale

Expr1 = -alfa + 1;
Expr2 = -2 alfa + 2;
Expr3 = 5 alfa;
Expr4 = -alfa + 1;

Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
 BaseStyle -> AbsoluteThickness[4], 
 PlotLegends -> 
  LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]], 
 AspectRatio -> 1]

If you plot this one, the same lines moved up/down, you can see that the sacale of y-axis is diferent because the y-range is longer. 

Expr1 = -alfa - 2;
Expr2 = -2 alfa + 4;
Expr3 = 5 alfa;
Expr4 = -alfa - 1;

Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
 BaseStyle -> AbsoluteThickness[4], 
 PlotLegends -> 
  LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]], 
 AspectRatio -> 1]

I want to maintain the same scale in the y-axis

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Expr1 = -alfa + 1;
Expr2 = -2 alfa + 2;
Expr3 = 5 alfa;
Expr4 = -alfa + 1;

p1 = Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
  BaseStyle -> AbsoluteThickness[4],
  PlotLegends -> 
   LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
  PlotRange -> {Automatic, {-5, 5}},
  AspectRatio -> 1];


Expr1 = -alfa - 2;
Expr2 = -2 alfa + 4;
Expr3 = 5 alfa;
Expr4 = -alfa - 1;

p2 = Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
  BaseStyle -> AbsoluteThickness[4],
  PlotLegends -> 
   LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
  PlotRange -> {Automatic, {-5, 5}},
  AspectRatio -> 1];

Grid[{{p1, p2}}]

enter image description here

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3
  • $\begingroup$ perfect That´s what I wanted, but... do you know any way to obtain as independent plots?, without a grid. Because I want to save the legends with the rigth bracket option SAVE AS... $\endgroup$
    – Mika Ike
    Commented Jul 16, 2014 at 18:39
  • 1
    $\begingroup$ @mika Ike@ Just remove the semicolons behind the definitions of p1 and p2. Now p1 and p2 pop up and you can save them indepently. $\endgroup$
    – eldo
    Commented Jul 16, 2014 at 18:49
  • $\begingroup$ Yes :-) sorry!! $\endgroup$
    – Mika Ike
    Commented Jul 16, 2014 at 19:02

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