@Carl Love Thank you!

I don't understanding everything of the code, but now it's up to me. :-)

Greetings 

Hey,

@Kitonum: I don't get it sry. I know how to use it for a curve but I can't figure out how to use it with my Problem.

@Carl Love: These are the variables from the matlab code:

temps := [0, 10, 20, 30, 50, 80, 100];

concs := [1,2,4,8,12,16,20,24];

densities := Matrix(8, 7, [[1.0033, 1.0029, 1.0013, .9987, .9910, .9749, .9617], [1.0067, 1.0062, 1.0045, 1.0018, .9940, .9780, .9651], [1.0135, 1.0126, 1.0107, 1.0077, .9999, .9842, .9718], [1.0266, 1.0251, 1.0227, 1.0195, 1.0116, .9963, .9849], [1.0391, 1.0370, 1.0344, 1.0310, 1.0231, 1.0081, .9975], [1.0510, 1.0485, 1.0457, 1.0422, 1.0343, 1.0198, 1.0096], [1.0625, 1.0596, 1.0567, 1.0532, 1.0454, 1.0312, 1.0213], [1.0736, 1.0705, 1.0674, 1.0641, 1.0564, 1.0426, 1.0327]]);

These datas are from a table which is build like that:

TABLE 2-37
Ammonium Chloride (NH4Cl)*
%      0 °C     10 °C     20 °C     30 °C    50 °C    80 °C    100 °C
1      1.0033 1.0029  1.0013    0.9987  0.9910  0.9749  0.9617
2      1.0067 1.0062  1.0045    1.0018  .9940   .9780    .9651
4      ...
:

Best regards