scientific-notation

问题 double x = 1500; for(int k = 0; k<10 ; k++){ double t = 0; for(int i=0; i<12; i++){ t += x * 0.0675; x += x * 0.0675; } cout<<"Bas ana: "<<x<<"\tSon faiz: "<<t<<"\tSon ana: "<<x+t<<endl; } this the output Bas ana: 3284.78 Son faiz: 1784.78 Son ana: 5069.55 Bas ana: 7193.17 Son faiz: 3908.4 Son ana: 11101.6 Bas ana: 15752 Son faiz: 8558.8 Son ana: 24310.8 Bas ana: 34494.5 Son faiz: 18742.5 Son ana: 53237 Bas ana: 75537.8 Son faiz: 41043.3 Son ana: 116581 Bas ana: 165417 Son faiz: 89878.7 Son

问题 What is the difference in PHP between a value that prints as -9.838335106976932e18 and one that prints as -9.838335106976932E+18? (note the "e18" vs "E+18") 回答1: Absolutely no difference. Those are two different conventions in printing a number in scientific notation. Specifically: the E can be either lower or upper case. The former is printed with format string %e , the latter (which is less common), with format string %E . the + before exponent (and/or base) can be omitted. Regarding the

问题 By default, Qwt displays large numbers on the axis in scientific notation: For my application, I'd really like to turn this off OR reformat the labels. Looking through the class documentation, it doesn't seem like any of the QwtScale classes have an option for this. Can this behavior be implemented by deriving a new class? If so, which class should it be derived from and which members would need to be overloaded? 回答1: Thanks to bkausbk, I was able to come up with this modified QwtScaleDraw :

问题 I am trying to gain control of the Holoviews Curve (though this should work for any other plotting element) and set the y-tick labels to be in scientific notations. In MatPlotLib I would do this with ticklabel_format(style='sci', axis='y', scilimits=(0,0)) . Currently I have this: But would like the Y axis numbers to be in scientific notations instead of the long decimal numbers currently shown on the Y axis. Is there anyway to do this and what is it? 回答1: HoloViews let's you supply a tick

问题 I am trying to turn on scientific notation in this plot so that the numbers on the y-axis don't take up so much space. Currently my code is: import matplotlib.pyplot as plt import matplotlib as mpl import pandas as pd mpl.rcParams.update({'font.size':15}) mpl.rcParams.update({'legend.columnspacing':0.5}) energy_cm = 1550835.86856494 energy_fm = 1456129.29966378 energy_cm_trad = 1393026.50949191 energy_fm_trad = 1314814.95236864 energy_cm_hw = 1200000 energy_fm_hw = 1100000 data_energy = {

问题 I put .describe() to a Dataframe, the output doesn't look nice. I want the output to show the whole number and not be simplified with exponentials. Input: df["A"].describe() How the output looks like: count 6.000000e+01 mean 7.123568e+04 std 2.144483e+05 min 1.000000e+02 25% 2.770080e+03 50% 1.557920e+04 75% 4.348470e+04 max 1.592640e+06 Name: A, dtype: float64 Expected Output: count 60.0 mean 7123.568 std 214448.3 min 100.0000 25% 2770.080 50% 15579.20 75% 43484.70 max 1592640.0 Name: A,

问题 I want to store scientific notation numbers in MySql. I've saved them to a field which has datatype decimal . The issue is that it stores it in normal notation (at least that what it seems when I view the number in the web console that comes with MAMP) and thus you need to allocate more bytes to the field ... which I believe will lead to having a very large database. Is there anyway to store the scientific notation as is (far fewer units of information), but still be able to do numeric

问题 I want to compare the results of different models (lm, glm, plm, pglm) in a table in R using stargazer or a similar tool. However I can't find a way to display the coefficients in scientific notation. This is kind of a problem because the intercept is rather large (about a million) while other coefficients are small (about e-7) which results in lots of useless zeros making it harder to read the table. I found a similar question here: Format model display in texreg or stargazer R as scientific

问题 Using bcdiv, i can't divide with small float using scientific notation : Working code : bcscale(30); $a = '1' ; $b = '0.00000001'; $result = bcdiv($a, $b); var_dump($result); Results in : string(20) "100000000.0000000000" Non-working code : bcscale(30); $a = '1' ; $b = '1e-8'; $result = bcdiv($a, $b); var_dump($result); Results in : Warning: bcdiv() [function.bcdiv]: Division by zero in C:\wamp\www\utilitaires\test_bcdiv.php on line XX NULL How can i do this division properly, with the less

问题 If I hardcode a number in my code using the scientific notation (e.g. 1e9 ) what will the type of that number be (int, long, float, double..)? When the significand or the exponent are floating point numbers it can't be an integer obviously, but what in the above case? 回答1: The e makes it a floating-point literal. From the JLS (§3.10.2. Floating-Point Literals): A floating-point literal is of type float if it is suffixed with an ASCII letter F or f ; otherwise its type is double and it can