Thanks for the answers but that is not exactly what i would like to do, here is the actual data:

\[Omega]11 = 3.756;
\[Omega]12 = 8.478;
\[Omega]13 = 4.8002;
\[Omega]14 = 4.002;
\[Omega]15 = 4.803;
\[Omega]16 = 10;
\[Omega]17 = 10;
\[Omega]21 = 5.702;
\[Omega]22 = 5.311;
\[Omega]23 = 4.684;
\[Omega]24 = 5.237;
\[Omega]25 = 4.677;
\[Omega]26 = 10;
\[Omega]27 = 5.808;
\[Omega]31 = 4.856;
\[Omega]32 = 4.466;
\[Omega]33 = 4.408;
\[Omega]34 = 4.748;
\[Omega]35 = 5.615;
\[Omega]36 = 6.012;
\[Omega]37 = 6.347;
\[Omega]41 = 6.338;
\[Omega]42 = 6.092;
\[Omega]43 = 4.688;
\[Omega]44 = 5.163;
\[Omega]45 = 5.725;
\[Omega]46 = 6.21;
\[Omega]47 = 6.13;
\[Omega]51 = 6.14;
\[Omega]52 = 4.35;
\[Omega]53 = 4.954;
\[Omega]54 = 5.65;
\[Omega]55 = 5.74;
\[Omega]56 = 6.08;
\[Omega]57 = 6.19;
A = ( {
    {2.7, 2.7, 2.7, 2.7, 2.7, 2.7, 2.7},
    {\[Omega]11, \[Omega]12, \[Omega]13, \[Omega]14, \[Omega]15, \
\[Omega]16, \[Omega]17},
    {\[Omega]21, \[Omega]22, \[Omega]23, \[Omega]24, \[Omega]25, \
\[Omega]26, \[Omega]27},
    {\[Omega]31, \[Omega]32, \[Omega]33, \[Omega]34, \[Omega]35, \
\[Omega]36, \[Omega]37},
    {\[Omega]41, \[Omega]42, \[Omega]43, \[Omega]44, \[Omega]45, \
\[Omega]46, \[Omega]47},
    {\[Omega]51, \[Omega]52, \[Omega]53, \[Omega]54, \[Omega]55, \
\[Omega]56, \[Omega]57}
   } );
ArrayPlot[A, Mesh -> True, DataRange -> {{0, 25}, {90, 120}}, 
 FrameTicks -> {{90, 95, 100, 105, 110}, {1, 5, 10, 15, 20, 25}}, 
 AspectRatio -> 1, PlotTheme -> "Detailed", 
 ColorFunction -> "Rainbow"]

Now , i would like the first row to have a label in the x coordinate of 0.5, the second of 1, 3rd of 5, 4th of 10 5th of 15 till 7th of 25 and in the y axis bottom row of 90 next of 95 one befor the last one 110 and nothing in the last one

i hope that explain a little more my problem

Thanks and Regards

A = {{0.12, 1.5, 0.36}, {0.48, 0.17, 0.87}, {1, 0, 1}};
MatrixPlot[A, Mesh -> True, DataRange -> {{1, 10}, {125, 135}}, 
 FrameTicks -> {{125, 130, 135}, {1, 5, 10}}, AspectRatio -> 1, 
 PlotTheme -> "Detailed", ColorFunction -> "Rainbow"]

Please have a look at the option DataRange. Or alternatively have a look at the FrameTicks and Ticks options.