The fight between young couples is a typical one willing to fight and the other willing to suffer. The two of them fought for a while, releasing the hormones that had been accumulated in their bodies for many days, and then they felt empty stomachs, and the smell of chicken soup in the kitchen became more and more intense.

"You eat the chicken legs, and I eat the wings. ”

Du Xiaodi fell asleep, was full of energy, and performed the duties of the hostess. She brought out the stewed chicken from the kitchen with the pot, put it on the small dining table in the courtyard, and served the rice again, then sat down face to face with Feng Xiaochen and began to enjoy a hearty dinner.

After getting along for a long time, Du Xiaodi no longer had the shyness of the past in front of Feng Xiaochen, and replaced it with a natural sense of closeness. Judging from the standards of 1985, Feng Xiaochen is a man with a rather postmodern style, young and golden, graceful, knows how to care about people, especially good at taking care of women, and does not smoke or drink, which is extremely rare among young men nowadays. Du Xiaodi's former girlfriend and current graduate students do not praise Du Xiaodi for his vision and good luck to be able to catch such a golden beetle.

"What were you just writing about?"

Nibbling on fragrant chicken wings, Du Xiaodi asked Feng Xiaochen casually. She remembered that when she first woke up, she saw Feng Xiaochen writing in the courtyard, and it seemed that he had written a lot of paper, so she asked curiously.

"I'm writing you a program. Feng Xiaochen replied.

"Writing a program?" Du Xiaodi felt a little surprised, she originally thought that Feng Xiaochen was writing his own things, maybe even writing an assignment from the Academy of Social Sciences, who would have thought that he was actually helping her write a program.

"What kind of program is it, is it my algorithm program for the welding heat process?" Du Xiaodi asked.

"yes. ”

"You even know that?"

"This thing about machinery is the same. Feng Xiaochen said with a little smugness. People who study machinery are not just learning what crankshaft transmission is enough, and materials science is also one of the important courses of mechanical majors, even more important courses than mechanical principles. When Du Xiaodi was sleeping just now, Feng Xiaochen took a cursory look at the information she found from her room, and his understanding of this problem deepened a lot, so he had the ability to help her design algorithms.

"You're not a mechanic. Besides, didn't you learn that bit of knowledge from your grandfather, when your grandfather died, there was no computer, how can you understand the algorithm of numerical simulation?" Du Xiaodi questioned. When talking about Feng Xiaochen's elders, she has become accustomed to omitting the word "you", and "your grandfather" becomes "grandpa", which has a very different taste.

Of course, Du Xiaodi knows that Feng Xiaochen's technical skills in machinery are very good, but no matter how good it is, there should be a limit, right? Numerical simulation technology, I heard Cai Xingquan say that it has just begun to heat up abroad, and it has not been widely used before, and even Cai Xingquan and other professors of a dry industrial university know nothing about it, basically relying on the gourd to draw scoops, and Du Xiaodi and his students are even more outrageous in painting. Du Xiaodi didn't know how Feng Xiaochen was in the past, but at least in the past year or so, Du Xiaodi didn't see Feng Xiaochen spend much energy reading professional books on engineering, why did he understand these things?

"You have to admit that there are geniuses in this world. Feng Xiaochen also knew that his golden finger was not easy to explain, and it was just an outsider, Du Xiaodi was his pillow person - uh, well, in fact, it was the future pillow person, and it was really not easy to hide these things from her. Since you can't hide it, and you can't say anything like crossing, you can only push it up to the genius.

"Then I'll see how genius does it. ”

Du Xiaodi said, wiped the oil stains on his hands with a rag, took what Feng Xiaochen wrote just now from the side, and looked at it in his hand. When Feng Xiaochen promised to help her contact the computer, she didn't have to worry about solving equations that couldn't be solved at all, which only made her a little easier, and the problem of simulation algorithms was still a problem for her. Now that she heard that Feng Xiaochen was even helping her write the algorithm, she naturally couldn't wait to take a look.

"What does this equation mean...... Mr. Cai told us about numerical simulation, but he didn't talk about it like this, and there was no such equation. ”

Du Xiaodi looked at Feng Xiaochen's formula for a while, and he was a little confused. An algorithm is actually a set of formulas, and then the formulas are turned into a computer program and the computer can follow them. Feng Xiaochen wants to design an algorithm for Du Xiaodi, so naturally he has to list the formulas first, and some numerical simulation algorithms, he still learned them in his previous life, and they have been useless for many years. What Du Xiaodi sees now is the algorithm written by Feng Xiaochen, and compared with the algorithm that Cai Xingquan taught her, the difference is not only in the world.

Feng Xiaochen was speechless, and he reminded: "I said, girl, can we finish eating first and then see." Specially stewed chicken to nourish your body, you only ate a few bites. ”

"Well, I'm almost full, just drink some soup later......," Du Xiaodi said perfunctorily, her eyes did not leave the few pieces of paper written by Feng Xiaochen for a moment, and she also took a pen and made a brief deduction on a blank piece of paper to help herself better understand Feng Xiaochen's thoughts.

Otherwise, people can become welding technicians at a young age, there is indeed something extraordinary, Feng Xiaochen sighed in his heart.

In the contact again and again, Feng Xiaochen had already felt Du Xiaodi's perseverance. It is said that among the 21 welders sent to Japan for training by the Ministry of Machinery, Du Xiaodi worked the hardest, and she was also the one with the best academic performance in the end. Du Xiaodi also delayed going to school because of family reasons when she was a child, otherwise with her diligence and smart talent, she would have been a doctor in Qingbei a long time ago.

"Forget it, I'll tell you about it. Feng Xiaochen admitted defeat, he threw down the chicken bones that had eaten all the meat, wiped his hands with a rag, and then moved the stool to Du Xiaodi's side and began to explain to her:

"We need to first build a non-equilibrium countable Markov chain according to the material properties of the workpiece, and for a directed graph formed by the Markov chain, there is such a corner condition...... If we assume that any one of its adjacent vectors is possible from the next state of departure, etc., then the probability that the next state y is expressed as follows......

Feng Xiaochen has already deduced the formula once, and there is no obstacle to talking about it. Du Xiaodi has been following Cai Xingquan for more than a year, and she can be regarded as having a certain foundation, and she can roughly understand what Feng Xiaochen said. When she encountered something she didn't understand, she was not polite, and asked Feng Xiaochen to explain it to her repeatedly until she understood.

Feng Xiaochen actually wanted to see Du Xiaodi's ability, to tell the truth, although Du Xiaodi was recommended to Cai Xingquan by him, he only knew that Du Xiaodi's welding level was superb, and he had no bottom when it came to theoretical research such as physics and mathematics.

In the process of telling, he has been observing Du Xiaodi's reaction, although there are many places that Du Xiaodi still doesn't understand, but just what he understands is enough to make Feng Xiaochen feel frightened.

More than a year ago, Du Xiaodi was just a welder with a junior high school education, but today, more than a year later, Du Xiaodi can actually understand the Markov chain and understand the concept of secondary optimization, what kind of miracle is this.

"Got it?"

After explaining all the algorithms, Feng Xiaochen looked at Du Xiaodi and asked.

Du Xiaodi had some excitement on her face, and she said with a light smile: "I don't particularly understand, but I am generally clear about the key links, and I will take a good look at the algorithm you wrote in the evening, it should be no problem." I think the algorithm you mentioned is better than what Mr. Cai taught us, his methods are quite troublesome, and the number of iterations is much more than yours. ”

"Of course, Director Feng's production must be the best. Feng Xiaochen bragged again, of course he also has the confidence to brag, the algorithms he said are ahead of this era, and can be used in the new century, which shows its vitality.

"Where did you learn all these things? Why haven't I seen you read a book on this?" Du Xiaodi asked.

Feng Xiaochen said: "Of course, I figured it out myself. As you said, at the time of my grandfather's death, there were still very few computers in China, and my grandfather himself didn't understand numerical simulation. However, he taught me advanced mathematics, and I think back then, my brother also brushed a whole book of Gildovic's, and did an ordinary mathematical analysis, isn't it like fun?"

"Blow, blow again!" Du Xiaodi pursed her lips and said happily, she actually likes to watch Feng Xiaochen brag, this is an alternative cool, compared to the "social person" who hangs more than 20 catties of gold chains around his neck and pretends to be cool, Feng Xiaochen's coolness with poetry and books in his belly is more intoxicating.

"You can digest this algorithm well, and if you understand this, you can at least be more than 10 years ahead of your peers. Feng Xiaochen said.

Du Xiaodi said: "You are blowing too outrageously, these things must be where you see them." However, I believe that Mr. Cai has definitely not seen it, and neither have our other teachers, brothers, and sisters. I'll go talk to Mr. Cai tomorrow, and he will definitely be very interested. ”

"However, if he asks you where these methods come from, how do you answer?" Feng Xiaochen asked worriedly.

Du Xiaodi smiled: "I just said that you invented it, didn't you just say that?"

"Well, well, what I said just now, it was all an illusion. Feng Xiaochen said, "That's it, if Lao Cai asks, you will say that I saw it on an unknown book, and now that book can no longer be found, I don't know if it is in the data room of the Economic Commission or in the data room of the Coal Research Institute." Anyway, it's never going to be found......"