If I understand correctly, here's how you can rescale a matrix to be from -1.4 to 2.4 instead of from 1 to 200:
A = reshape(1:200,10,20);
new_A = (A-x(1))./(x(2)-x(1)).*(new_x(2)-new_x(1))+new_x(1);
disp(A); disp(new_A);
1 11 21 31 41 51 61 71 81 91 101 111 121 131 141 151 161 171 181 191
2 12 22 32 42 52 62 72 82 92 102 112 122 132 142 152 162 172 182 192
3 13 23 33 43 53 63 73 83 93 103 113 123 133 143 153 163 173 183 193
4 14 24 34 44 54 64 74 84 94 104 114 124 134 144 154 164 174 184 194
5 15 25 35 45 55 65 75 85 95 105 115 125 135 145 155 165 175 185 195
6 16 26 36 46 56 66 76 86 96 106 116 126 136 146 156 166 176 186 196
7 17 27 37 47 57 67 77 87 97 107 117 127 137 147 157 167 177 187 197
8 18 28 38 48 58 68 78 88 98 108 118 128 138 148 158 168 178 188 198
9 19 29 39 49 59 69 79 89 99 109 119 129 139 149 159 169 179 189 199
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
-1.4000 -1.2090 -1.0181 -0.8271 -0.6362 -0.4452 -0.2543 -0.0633 0.1276 0.3186 0.5095 0.7005 0.8915 1.0824 1.2734 1.4643 1.6553 1.8462 2.0372 2.2281
-1.3809 -1.1899 -0.9990 -0.8080 -0.6171 -0.4261 -0.2352 -0.0442 0.1467 0.3377 0.5286 0.7196 0.9106 1.1015 1.2925 1.4834 1.6744 1.8653 2.0563 2.2472
-1.3618 -1.1709 -0.9799 -0.7889 -0.5980 -0.4070 -0.2161 -0.0251 0.1658 0.3568 0.5477 0.7387 0.9296 1.1206 1.3116 1.5025 1.6935 1.8844 2.0754 2.2663
-1.3427 -1.1518 -0.9608 -0.7698 -0.5789 -0.3879 -0.1970 -0.0060 0.1849 0.3759 0.5668 0.7578 0.9487 1.1397 1.3307 1.5216 1.7126 1.9035 2.0945 2.2854
-1.3236 -1.1327 -0.9417 -0.7508 -0.5598 -0.3688 -0.1779 0.0131 0.2040 0.3950 0.5859 0.7769 0.9678 1.1588 1.3497 1.5407 1.7317 1.9226 2.1136 2.3045
-1.3045 -1.1136 -0.9226 -0.7317 -0.5407 -0.3497 -0.1588 0.0322 0.2231 0.4141 0.6050 0.7960 0.9869 1.1779 1.3688 1.5598 1.7508 1.9417 2.1327 2.3236
-1.2854 -1.0945 -0.9035 -0.7126 -0.5216 -0.3307 -0.1397 0.0513 0.2422 0.4332 0.6241 0.8151 1.0060 1.1970 1.3879 1.5789 1.7698 1.9608 2.1518 2.3427
-1.2663 -1.0754 -0.8844 -0.6935 -0.5025 -0.3116 -0.1206 0.0704 0.2613 0.4523 0.6432 0.8342 1.0251 1.2161 1.4070 1.5980 1.7889 1.9799 2.1709 2.3618
-1.2472 -1.0563 -0.8653 -0.6744 -0.4834 -0.2925 -0.1015 0.0894 0.2804 0.4714 0.6623 0.8533 1.0442 1.2352 1.4261 1.6171 1.8080 1.9990 2.1899 2.3809
-1.2281 -1.0372 -0.8462 -0.6553 -0.4643 -0.2734 -0.0824 0.1085 0.2995 0.4905 0.6814 0.8724 1.0633 1.2543 1.4452 1.6362 1.8271 2.0181 2.2090 2.4000
It is entirely possible that I do not understand correctly, in which case, can you please clarify what you want to do? Specifically, how is x related to your matrices?