Are Data Structures and Algorithms Important for Data Science?

Though data science heavily uses statistics, you can run stats on data only when you know data structures. So knowledge is data structures is very very important.Now Algorithms.

When you talk about data science, usually a lot of data is involved. When such huge data is being handled, we cannot afford using inefficient algorithms to work on that data.Suppose with poor knowledge you write an algorithm that is slow it'll take long to run results and result in a really inefficient system.

Example factorial algorithm. It's not related to data science, but it's a really good example. If you write factorial code in a naive recursive way it runs in non polynomial time.

It's terrible.If you have knowledge of algorithms and dynamic programming you'll write an algorithm that runs in linear time.Knowledge of design and analysis of algorithms is very important.

That's what creates the difference between a system runs training for 5 hours and one which runs within seconds.Hope this helps

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How often should your husband call you while heu2019s at work?

My wife never called me at work.

I only called her in the event of unexpected circumstances. The last time I called her from work was when I was having a heart attack. I called to tell her that I would not be home early to take her shopping, told her where may car was in the parking lot, so she could get it picked up and taken home, because the hospital I was at had no coronary unit, and I would be taken by ambulance to the hospital of my choice and would call her from there after I knew more.

I chose the hospital easiest for her to get to.It would pain me to think that she was having a conversation on the phone during the one time I had to communicate with her before a notice of one kind or another by the hospital. We did not phone to keep track, we knew our individual responsibilities.

The phone was not a social device in our home. It was a communications tool.Al

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Why is reddit so popular?

tl;dr Reddit built a platform that met the needs of visitors it attracted. By having a functional website that appeals to a wide community, appearance was not as important as maintaining it's client base.--Because good functionality typically wins over beautiful design:Google started as a great search engine with a simplistic user interface.

It didn't need to be beautiful to bring back accurate search results.Craigslist looks ugly but delivers a service to it's customers. After all how beautiful does a classified adverts site have to look?

Because ugly can triumph beauty:This article examines the effectiveness of ugly banner adverts - The Ugly Truth. Ugly banner adverts had higher conversion rates than more colourful and attractive adverts. Humans are sometimes drawn to ugly and boring.

Because marketing comes down to four p's. You need to think about all four: Often ugly sites have an intelligence and powerful marketing campaign and/or are incredible flexible. PlentyOfFish spent money on advertising to attract visitors and constantly improved functionality to meet customer needs.

Source: Keep It Simple Stupid (KISS) Ugly Websites That Went Viral

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How can I find my spiritual purpose by reading my birth chart?

First of all, you have asked an excellent question, especially if you are seeking to learn about Jungian or Humanistic astrology.I find your quest to be a far better and much more noble application of astrology than attempting to predict specific, concrete events.

(That approach indirectly robs an individual of self actualization or self determination. )I see that you have already received an answer that mentions the natal 9th House. A good place to start, but there is so much more to consider.

You need to know that from the perspective of Humanistic astrology, your entire horoscope is a symbolic representation of your musical score that you have in this life to sing and dance to. How well you express your music is up to you.If I had the opportunity to discuss your spiritual challenges (as noted in your natal chart) I would bring up the importance of your Lunar Phase, the symbolism of your North and South nodes, and the major aspects to your natal Sun and Moon.

These few items alone would easily keep us busy for an hour or longer. In working with astrology for over 22 years, I firmly believe that you have hit upon one of the most important, most valuable, and significant applications of astrology

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Which is the best compiler for C & C programming?

Thanks for the A2A.

"Best" is a pretty open term and depends on your personal criteria.For me, GNU C compiles for all of the platforms I'm interested in and implements the standards quite well IMO, so for me it's the "best." Does it produce the fastest, tightest executable of all C compilers?

No, but that's not one of my more important criteria. A Windows person could say Microsoft C for the exact same reasons (and with faster executables and a simply terrific IDE) but that wouldn't necessarily make it the right answer for you or for me.I would guess Intel C is still probably the go-to choice for the fastest executables.

Still doesn't necessarily make it the right choice for either of us, it depends on our criteria. Embarcadero will flat out tell you that Borland C is "the best" in their advertising, which kind of indicates to me they don't get this "different people may have different criteria" concept. I've never really been a fan of their C because, when I tried it (years ago), it seemed to have trouble with code that worked great with other compilers.

However Embarcadero truly did improve Delphi so it's possible they've improved Borland C as well.

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What does "" mean in C programming?

The operator in C is one of the languageu2019s compound assignment operators.

It is essentially a shorthand notation for incrementing the variable on the left by an arbitrary value on the right.The following two lines of C code are identical, in terms of their effect on the variable z:z z y;t// increment z by yz y;tt// increment z by yBoth of these statements do the same thing. The current value of z and the current value of y are added together, and the sum is placed into variable z, replacing the value that had been stored in z.

Most modern compilers will generate identical code for these two statements.If you happen to be incrementing by 1, then all four of the following C statements will have the effect of incrementing variable z by 1:z z 1;t// increment z by 1z 1;tt// increment z by 1z;tt// increment z by 1z;tt// increment z by 1Most modern compilers will generate identical code for these four statements. The compound assignment operators, along with all other C operators, are shown in this handy table, which includes the precedence and associativity for each operator:nC Programming Language Operators

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At work, when passing someone in a narrow hallway, why do some people not say "Hi" when you say "Hi?

"

Differs by person. However, in an office where people are constantly passing each other in hallways, it may be perceived as an annoying waste of time. Theyu2019re walking down the hallway to get somewhere, not to socialize.

And if they are thinking about where they are going or something they have to do, talking to you would derail their thoughts. In some places with a dense population, people show respect for otheru2019s personal space by not saying something that demands a response. People have to carve out a sense of personal territory in crowded circumstances, and learning to ignore each other is part of the unspoken social contract.

Iu2019m from NY, and when I moved to Georgia for grad school I remember being driven CRAZY by strangers talking to me. There I would be, walking along, trying to work out how I would approach some stressful part of my Masteru2019s Thesis later that day, and a total stranger inserted himself into my mental space and demanded I pay attention to him. (It usually involved a question, like u201chi, how are you?

u201d) Where *I* come from, thatu2019s considered rude.Not everyone appreciates aggressive friendliness.

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What are some of the best career objectives written in a resume?

Please do not waste precious space on your resume by writing a Career Objective. When you apply for the job, it is obvious that that is your immediate career goal. Your long term career goal is more of a discussion-to-be-had-during-the-interview and writing it on your resume will create unnecessary confusion and ambiguity.

Writing statements as suggested in Raj Kumar's answer to What are some of the best career objectives written in a resume? are examples of what not to write. These seems like words from a thesaurus have been strung together to make a complex but meaningless sentence which does not convey anything useful to the reader about the applicant.

The only time I would suggest to write a Career Objective is when the applicant is a student seeking a job for the first time (though not in all cases) or an applicant who is a career changer. Only in these two cases, writing a brief career statement is at times useful.I usually prefer to write a statement like this example, "Teacher with over a decade of experience in teaching English Language & Literature to middle and high school, keen to leverage strong writing and editing skills, seeking entry level positions in the publishing industry.

" Hope this helps

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What will be the job scenario for data science in 2020?

Many things mean a data scientist today, and as the field matures we will likely see them disentangling over the next few years.One class of data scientists will focus on improving business operations.

They will be adept at understanding the overall business workflows, pulling data out of the myriad enterprise systems (Salesforce, Marketo, Hubspot, ), and at detecting causal relationships. They will contribute to lead scoring, revenue forecasting, pricing, and promotions.The second class will specialise in product development.

They will worry about finding unique insights from instrumented data from the product, the effect of feedback loops, and setting up correct objective functions, metrics, and experiments. They will be an integral part of the product development process improving product experiences with predictive components and iterative improvements through continuous A/B testing.Another class of data scientists will focus on implementing data and training pipelines at scale.

They will focus on scalable algorithms for machine learning, efficient collection and storage of data, and enabling the product infrastructure for rapid experimentation. They will ensure that the product architecture is set up for data led product iteration, and that the predictive components work in sync with the other product components

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Is u(t) energy signal or power signal?

The unit step function has a discontinuity at zero.

So it is not integrable and we cannot define an energy or power for the signal. To integrate this function, we would need to use distributions like the unit impulse. See:Nikhil Panikkar's answer to Fourier Analysis: What's the difference between a spectrum having a finite value at a particular frequency and one having an impulse at a particular frequency?

However, for engineering purposes, we can give a hand-wavy definition by ignoring its behaviour before zero and defining the function to be unity at zero. Then the unit step becomes a periodic function.A periodic function has infinite duration, hence its energy will be infinity, and since the energy integral does not decrease over consecutive time intervals, it might seem that we cannot define power for the signal.

But here is the catch - a periodic signal can be represented by its behaviour over a single period- and the energy over a single period is finite. Hence we can define power for a periodic signal! So the unit step is also a power signal.

For questions regarding the periodicity of a constant signal, see:Nikhil Panikkar's answer to Is a DC signal aperiodic or periodic?.