variable-assignment

问题 This question already has answers here : 'AND' vs '&&' as operator (10 answers) Closed 4 years ago . Why is $x true in this statment? $x = true and false; I've got the problem with some variables but I could reduce the problem to the primitive boolean values. Update: As you see in the replies the effect has to do with the operator precedense in PHP. There is also a good explanation about the problem in this question, which I couldn't find in the net before since I didn't know that I have a

问题 Check out this list. I need each one turned into a variable and set equal to 0. Example: ;1-Methyoxy-2-Propanol would be: $OneMethoxyTwoPropanol = 0 ;and 1,2-BUTADIENE would be: $OneTwoButadiene = 0 Assigning them to a variable wouldn't be a problem, but there are 1500 of them. 回答1: If i had to do this work i'll make it this way : I'll change the case of each word : Regex to change to sentence case Make a "SearchAndReplace" : 1 -> One 2 -> Two ... {underscore} -> '' {space} -> '' ... Then in

问题 If I have two variables, for example (define x 10) (define y 20) And I want to create a new variable, using the values of x and y to create the name, how would I go about doing so? For example let's say I want to make a new variable called variable-x-y (define variable-x-y "some-value") In this case, x would be 10 and y would be 20. Basically to summarize everything, I want to be able to enter variable-10-20 and have it return "some-value" I'm sorry if this sounds like a novice question. I'm

问题 so I come from a heavy python background, and I'm trying to wrap my head around javascript. Here I have a function that returns an array of track IDs for soundcloud songs by the artist 'v-2-followers'. How would I go about assigning the output of SC.get(stuff) to a variable to reuse the track list in another function. I'm sure I'm missing something fundamental. I'm less looking for an answer that explains how to do this, but more why it's done like that. That said I would also very much

问题 My question is that, I want to multiply 2 number which has 1 million digit. When I tried to assign 1 million number to BigInteger, Compiler is giving to me error. The error is that:"constant string too long". 回答1: BigInteger is indeed the way to store such large integers, although hundreds or a few thousands of digits are more typical use cases. However, Java class files have limitations that won't allow hard coding a literal number that large. Instead, store the number in a file and read it

问题 The C++11 standard (5.17, expr.ass) states that In all cases, the assignment is sequenced after the value computation of the right and left operands, and before the value computation of the assignment expression. With respect to an indeterminately-sequenced function call, the operation of a compound assignment is a single evaluation Does this mean, that the expression: int a = 1, b = 10; int c = (a+=1) + (b+=1); if ( c == 10+1+1+1 ) { printf("this is guaranteed"); } else { printf("not

问题 I have a div on my page '.php' <div id="force_id"></div> This prints an id for each product on the page. Ex: 126500 How do I assign this value of the other PHP variable (not click, on load for example) I use it here : $limit = ?????? (Value should be the id value here. For example 126500) $plans = mysql_fetch_array(mysql_query("select * from motors WHERE prod_id = '$limit'")); Thank you in advance ... 回答1: If you are looking for something on-load then you will need to use Javascript with some

问题 I have defined an unsupervised problem in tensorflow, I need to update my B and my tfZ with every iteration, but I don't know how to update my tfZ using the tensorflow session. tfY = tf.placeholder(shape=(15, 15), dtype=tf.float32) with tf.variable_scope('test'): B = tf.Variable(tf.zeros([])) tfZ = tf.convert_to_tensor(Z, dtype=tf.float32) def loss(tfY): r = tf.reduce_sum(tfZ*tfZ, 1) r = tf.reshape(r, [-1, 1]) D = tf.sqrt(r - 2*tf.matmul(tfZ, tf.transpose(tfZ)) + tf.transpose(r) + 1e-9)

问题 In the function source for stats::bw.nrd0 , there is a complicated (to me) if statement: > bw.nrd0 function (x) { if (length(x) < 2L) stop("need at least 2 data points") hi <- sd(x) if (!(lo <- min(hi, IQR(x)/1.34))) (lo <- hi) || (lo <- abs(x[1L])) || (lo <- 1) 0.9 * lo * length(x)^(-0.2) } <bytecode: 0x0000000010c688b0> <environment: namespace:stats> Is || to be interpreted in a special way, compared to the regular operator | ? Where/how is lo being assigned / re-assigned? How would this be

问题 I currently am working with a constructor which takes in of type object I am then testing it's type based on instanceof Public MyClass (Object obj) { if(obj instanceof CusClass1){ CusClass1 myObject = (CusClass1) obj; globalVar1 = myObject.getAttrib1(); globaVar2 = myObject.getAttrib2(); } if(obj instanceof CusClass2){ CusClass2 myObject = (CusClass2) obj; globalVar1 = myObject.getAttrib1(); globaVar2 = myObject.getAttrib2(); } } Can this be offset to an initalise method called from within