novel for you Page 19
Page 19
Ke'er, don't cry, I didn't say there is a problem with your code, I just said that it needs to be optimized, you can read the paper revised by the senior, and leave the rest to me.
After finishing speaking, he ignored the two of them and continued to lower his head to think about what he occasionally drew on the paper.
Half an hour later, the crackling sound resounded through the competition area again.
This time, only a handful of people took a look at Chen Nuo, while the others worked hard.
Forty hours have passed since the game.
The time is tight and the tasks are heavy, so there is no room for them to waste time.
This time, after more than three hours, it stopped again.
I saw the code scrolling like a waterfall on the computer screen.
The debugging is completed, and the time is only about half of the last time.
Done, call it a day!
Chen Nuo let out a long breath. Although he was a little tired, he was full of sense of accomplishment.
The two eldest ladies, wake up and go back!
Ye Xinran and Chen Keer, who were woken up by Chen Nuo, were a little confused, looking at Chen Nuo who was working.
Why are you dismantling the host?
Papers and programming are kept private!
Are you stupid? Surveillance is everywhere here, and there are teachers proctoring the exam. Is it necessary?
Yes, yes!
Chen Nuo's answer was a little uncertain, and he was a little confused because he was so busy that he forgot to monitor this matter.
Alright, let's go, go back to sleep, let you see what a miracle is tomorrow morning!
After speaking, he took the lead and walked towards the research room. Ye Xinran and the two looked at each other and followed helplessly.
He fell asleep until nine o'clock, and after washing up, Chen Nuo returned to the competition area.
Ye Xinran and Chen Ke'er had already arrived and brought him breakfast.
Are you two beauties ready?It's time to witness the miracle!
After finishing talking, click to run.
Just for a moment, an interface popped up on the computer screen.
On the left are various parameters, on the right is a color-coded map of the Xia Kingdom, and on the bottom are forecast results and descriptions.
That's it?
The two were speechless, isn't this page very simple?
Mistake, come again!
After Chen Nuo selected the province, forecast time and other parameters in the parameter area on the left, he clicked OK.
I saw that the color of Nanhe Province on the map of Xia Kingdom suddenly turned dark. Every other province had an arrow pointing to Nanhe Province, and Nanhe Province also had an arrow pointing to other provinces.
There are also some data and indicators on the arrows. The most important thing is that these arrows are dynamic.
The blue arrow points to the data and indicators, which is the population flow from each province to Nanhe Province, and the red arrow is the data from Nanhe Province to other provinces
Speaking of this, Chen Nuo clicked on the map of Nanhe Province with the mouse again, only to see the map of Nanhe Province suddenly enlarged.
Nearly [-] indicators such as birth rate, death rate, and dependency rate all appear on the map and are marked by color.
These data can all be exported.
The two people who saw this page were dumbfounded.
The eyes of the other contestants who secretly paid attention to this place were full of obedience.
It is not complicated to make a map, and it is not difficult to make it dynamic, digital and predictable.
But the associated logic and algorithm in this model, every step is a natural barrier.
It is not an exaggeration to say that it is a miracle to get this done in one day.
Let's predict Xia Guo's birth rate, death rate, migration rate, specific number of people, etc. last year!
After Chen Nuo finished speaking, he operated on the parameter column, and after clicking OK, all the data were clear at a glance.
But after seeing the data, the three of them looked at each other in blank dismay.
Chen Nuo, are you sure there is no problem with this data?
After a while, Ye Xinran asked in a low voice.
Yes, it should be fine!
Chen Nuo was also a little surprised, just because the predicted data was too astonishing.
It is estimated that the population born in Xiaguo last year was 1003.8 million, with boys accounting for 52.7% and girls accounting for 47.3%.
Looking at this data alone is nothing, but the number of people dropped by 461.5 million compared with the previous year, a drop rate of -31.5%.
It is best to describe it as a cliff-like decline.
If this data is correct, then there is really a big problem with Xia's population.
You guys wait for me, I'll go through the database, model and code again!
Chen Nuo's face was serious, and he checked and calculated bit by bit, starting from the most original data sheet.
Taking advantage of this time, Ye Xinran and Chen Ke'er checked other indicators, as well as the indicators of each province.
The more you look at the two, the uglier their faces become, and in the end, their foreheads are covered with cold sweat.
It is predicted that after 10 years, the population of Xia Kingdom will reach the peak of 14.42 billion, and then begin to show negative growth. After 30 years, it will reach 13.65 billion.
If this data is released, the three of them will definitely criticize them.
Three hours later, Chen Nuo raised his head and let out a long sigh of relief.
There is no problem with the database, there is no problem with the model, and there is no problem with the code.
and then?
Ye Xinran asked impatiently.
Then there is no problem with our prediction results.
Seeing Ye Xinran opened his mouth, Chen Nuo said again: I know what you want to ask, but this is the truth.
You have to understand that there are many ideas for modeling, and there are many variables to consider. The models established by each group are different, and the prediction results are different. Therefore, there is no question of whether the model and the prediction result are right or wrong, only the question of accuracy.
Chapter 28 The Scary Population Forecasting Model
It took sixty hours.
After Chen Nuo and the other three submitted their thesis and code, they left the competition area.
Handing in the papers in advance, this coquettish operation shocked the invigilating teacher beyond words.
Not to mention Huaqing, even the entire Xia Kingdom has never heard of it since the Mathematical Modeling Contest was held in 92.
The regulations did not say that papers cannot be submitted in advance, and the invigilators can only seal up their papers and codes.
With dozens of pairs of eyes full of grief, indignation, envy, despair, and jealousy, the three left gracefully.
Chen Nuo, you have worked really hard this time. As a thank you, this lady treats you to a big meal!
Hmm, and me, I invite you too!
Just as Ye Xinran finished speaking, Chen Ke'er nodded like a chicken pecking at it.
Forget it, wait until the results of the competition come out, if you make a mistake, you still have to beat me to death!
Although Chen Nuo said so, he was very sure in his heart that his model should be the best.
According to his own estimation, the result of the prediction will not exceed five ten-thousandths.
After staying up for two days and two nights, I am also a little tired and want to go back to rest!
Humph, straight guy!
After Ye Xinran grumbled, remembering what she had done to Chen Nuo in the past two days, she had no choice but to give up.
Remember not to spread it to the outside world before the results come out!
The three of them separated and went back to their dormitories.
Back in the dormitory, the brothers in the dormitory were shocked when they saw Chen Nuo coming back early.
Fourth child, I also read this year's questions, it's a bit more difficult, but you can't give up the competition!
That is, if you don’t know how to answer question A, let’s design a head office of cans for question B!
Giving up and escaping is not our Huaqing style!
hey you let me down
The three roommates in the dormitory looked as if they hated iron but steel, and Chen Nuo's forehead was twitching with veins.
But he didn't say anything. If he told the three of them that he had handed in the test ahead of time, he wouldn't be able to sleep tonight.
The game is over and the day is back on track.
Chen Nuo went to class normally in the morning, and occasionally went to the offices of Zhao Yuan and Wang Chengde to listen to the two professors talk about new discoveries in the scientific research field.
The rest of the time is either spent in the library or delivered food, and the days are very fulfilling.
At this moment, in the research room of the Department of Mathematics of Nanhe University, more than a dozen professors were flipping through papers.
What kind of mess are these, 4000 million people will be born next year?Do you have any common sense!
Lao Li, 4000 million is okay. I just saw a one with only 180 million. According to this forecast, wouldn’t it be a negative growth in two years?
The same scene is happening in the office of the Department of Mathematics of WH University in Beihu.
Lao Huang, what do you think the students are thinking now? They asked to design a can, but someone directly designed and drew a cylinder, gave a bunch of dimensions and it was over.
You are reliable anyway, I just saw someone who said that it can be designed into the shape of a Klein bottle, and gave a lot of formulas and arguments, so I wanted to ask him, this kind of bottle only exists in the four-dimensional space How to make something in Blue Star.
"Good, good, good, finally a good seedling has emerged!"
An exclamation resounded throughout the research room of the Department of Mathematics of Peking University.
The professors who were flipping through the papers all looked up at the gray-haired old man.
Xiao Qin, Xiao Song, Xiao Qi, take a look, this model is interesting.
The old man let out a low cry, this model is exactly Chen Nuo's.
The three people who were called were stunned for a moment, and walked over together.
The old man's name is Chu Xiutong, and he is also well-known in the international mathematics circle. He is proficient in physics, materials and other subjects. Half of the mathematics professors in Peking University come from him.
They are also very interested in the model that can make the old man applaud.
Half an hour later, the three of them were shocked, just because the partial differential equations, matrices, etc. used in this model were proficient.
The ingenuity of the conception is amazing, but the idea is too bold, even a little deviant.
What do you think of this model, is it feasible?
Facing the old man's question, after the three of them looked at each other, the older Song Hui spoke.
Mr. Chu, the ingenious conception of this model and the novelty of thinking are far superior to others. At least since I have been a judge of the competition for more than ten years, there is no one comparable to this model.
However, the population prediction model looks at the accuracy. To be honest, at present, I am a little uncertain!
The other two professors also nodded, obviously agreeing with Song Hui's statement.
This is easy to handle, you use his model to export the population forecast data of last year, I will ask the Provincial Bureau of Statistics for the data, just compare it!
The old man was completely attracted by this paper, and even couldn't wait to verify it.
Xiao Lu, I'm Chu Xiutong, did the population statistics of Beihe province come out last year?
Hearing that it was Chu Xiutong on the other end of the phone, he was startled for a moment, and hurriedly said: Mr. Chu, coincidentally, the data was just compiled last night, and the review started today!
Okay, then give me a copy of the population results of Beihe Province, and I will verify a subject.