t****t
发帖数: 6806 | 1 According to standard 18.2:
size_t is implementation-defined *unsigned* integer type, large enough to
contain the *size in bytes* of any object.
ptrdiff_t is implementation-defined *signed* integer type that can hold the
difference of two subscripts in an array object.
So, basically by definition, size_t is the result type of "sizeof" operator;
ptrdiff_t is the result type of "-" operator when the operand are pointers.
However, sizeof ptrdiff_t is NOT necessary sizeof pointer. sizeof pointer is
... 阅读全帖 |
|
t****t
发帖数: 6806 | 2 "A parameter in the replacement list, unless preceded by a # or ##
preprocessing token or followed by a ## preprocessing token (see below), is
replaced by the corresponding argument after all macros contained therein
have been expanded. Before being substituted, each argument’s preprocessing
tokens are completely macro replaced as if they formed the rest of the
preprocessing file; no other preprocessing tokens are available."
换句话说, 如果参数在后面没有前缀#或者是##的operand, 那么参数先被扩展. 所以在
h(a) -> g(a)里, a不是#或者##... 阅读全帖 |
|
y*******g
发帖数: 6599 | 3 我试了没这个问题
只是
Traceback (most recent call last):
File "", line 1, in
File "", line 6, in coef
TypeError: unsupported operand type(s) for ^: 'float' and 'int' |
|
|
j*****g
发帖数: 16 | 5 简单测试一下楼主的class, 发现这句不能compile:
this->children->parent = a;
main.cpp: In constructor ‘A::A(A*, int)’:
main.cpp:25:
error: base operand of ‘->’ has non-pointer type ‘std::vector
allocator >’
这是为什么呢？多谢！ |
|
x******a
发帖数: 6336 | 6 I am working on the example in accelerated C++.
I have overloaded operator+= , operator+ , and operator<<.
the following code does not work.
I got "invalid operands to binary expression('ostream'(aka 'basic_ostream<
char>') and 'myString') when compiling the code.
myString s1="hello";
myString s2="world";
std::cout<< s1+s2 <
it worked in the following way.
myString s1="hello";
myString s2="world";
myString s=s1+s2;
std::cout<< s <
what should I do to make the first one work... 阅读全帖 |
|
k****e
发帖数: 126 | 7 C99里面对function call是这样规定的，6.5.2.2 Function calls:
If the expression that denotes the called function has a type that does
include a prototype, the arguments are implicitly converted, as if by
assignment, to the types of the corresponding parameters, taking the type of
each parameter to be the unqualified version of its declared type.
对于assignment是这样规定的，6.5.16.1 Simple assignment：
one operand is a pointer to an object or incomplete type and the other is a
pointer to a qualified or unqualified ver... 阅读全帖 |
|
d******e
发帖数: 2265 | 8 这个面试还是作业？
两个stack.
一个opeator,一个operand.
scan left to right.
high order op than current top of op stack. 压站
otherwise, compute
O(1) |
|
t****t
发帖数: 6806 | 9 "The exceptions are when the array is the operand of a sizeof or & operator,
or is a string literal initializer for a character array."
C FAQ |
|
x******a
发帖数: 6336 | 10 is it an error in my code?
$python -OO myfile.py
Traceback (most recent call last):
File "myfile.py", line 10, in
import pandas as pd
File "/home/user/opt/anaconda/lib/python2.7/site-packages/pandas/__init__.
py", line 45, in
from pandas.io.api import *
File "/home/user/opt/anaconda/lib/python2.7/site-packages/pandas/io/api.py
", line 11, in
from pandas.io.sql import read_sql, read_sql_table, read_sql_query
File "/home/user/opt/anaconda/lib/python2.... 阅读全帖 |
|
m*********a
发帖数: 3299 | 11 原话
The arrow operator requires a pointer operand and yields an lvalue.
The dot operator yields an lvalue if the object from which the member is
fetched is an lvalue; otherwise the result is an rvalue. |
|
m*********a
发帖数: 3299 | 12 primer c++ 5
The arrow operator requires a pointer operand and yields an lvalue.
The dot operator yields an lvalue if the object from which the member is
fetched is an lvalue; otherwise the result is an rvalue. |
|
m*********a
发帖数: 3299 | 13 这个是
primer c++ 5
The arrow operator requires a pointer operand and yields an lvalue.
The dot operator yields an lvalue if the object from which the member is
fetched is an lvalue; otherwise the result is an rvalue.
除非这个是不对的，啥叫原版？我没有看过中文的计算机教程
对我来说，英文比中文好理解
所以，批评别人，也要看看自己的批评的方向对不对 |
|
gw
发帖数: 2175 | 14 这样定义了数据类型
#ifdef USE_DOUBLES
typedef double dataType;
#else
typedef float dataType;
#endif
然后在程序中如果出现
std::complex x,y;
x=complex(2.0,0);
y = 2.0*x
就会有这样的问题：
Type no match for 'operator/' (operand types are 'std::complex' and '
double')
如何破？ |
|
F****n
发帖数: 3271 | 15 because the operators overloaded by std::complex only accept floats
as operands. |
|
z*****n
发帖数: 7639 | 16 Hi,
I got a problem at the last step.
I followed the way as you said, but using adobe PS printer
instead of yours. Everything is ok to generate PS document
containing the clipped figure. But when use gsview to
output pdf file, it always says:
This PostScript file was created from an encrypted PDF file.
Redistilling encrypted PDF is not permitted.
Unrecoverable error: undefined in get
Operand stack:
--nostringval-- --nostringval-- quit
gsapi_execute_cont returns -21
gsapi_exit returns 0
op |
|
l*******r
发帖数: 322 | 17 ps2pdf template.ps template.pdf
不带参数的时候编译就没有问题
ps2pdf -dPDFSETTINGS=/prepress template.ps template.pdf
带了参数就报错：
MiKTeX GPL Ghostscript 8.15 (2004-09-22)
Copyright (C) 2004 artofcode LLC, Benicia, CA. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Unrecoverable error: undefined in get
Operand stack:
--nostringval-- true
好像根本没有解释那些参数，以前不是这样的，可能是什么问题呢？
我是在Cygwin下使用，装的是CTex
焦头烂额，谢谢！ |
|
l**e
发帖数: 6 | 18 你是不是用了特殊的sty file ?
试了一会,一般好像是不行:
下面这个文件,只有第一个图可以正确显示, 余下两个都不行.
Error Message:
gs: ERROR: /undefined in ÿØÿà
gs: Operand stack:
gs:
gs: Execution stack:
.......
gs: Current allocation mode is local
gs: Current file position is 5
\documentclass{article}
\usepackage{amssymb,amsmath}
\usepackage{graphicx}
\usepackage[dvips]{epsfig}
\begin{document}
\begin{figure}[ht]
\begin{center}
\psfig{file=angle-all.ps,height=3.0in,angle=0}
\end{center}
\end{figure}
\newpage
\begin{figure}[ht] |
|
y**b
发帖数: 10166 | 19 我用的opensuse 10.3，用ps2pdf或dvipdf的时候出现下面错误。
以前用低版本的时候要改个什么参数才能通过，好像是stack太小，
处理不了大量的图像？
ERROR: /ioerror in --image--
Operand stack:
--nostringval--
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --nost
ringval-- 2 %stopped_push --nostringval-- --nostringval-- --no
stringval-- false 1 %stopped_push 1 3 %oparray_pop 1 3
%oparray_pop 1 3 %oparray_pop 1 3 %oparray_pop .runexec2
--nostringval-- --nostringval-- --nostr |
|
d****r
发帖数: 1017 | 20
多谢了.
我的是MikTex2.4. dos下它也不会自己装.而且我用它自带的update或者
package manager都没用.
现在好像问题是ps到pdf的转化. 我在linux上用
ps2pdf beamerexample-conference-talk.ps
得到的错误如下:
Error: /rangecheck in --stroke--
Operand stack:
--nostringval-- --nostringval-- --nostringval-- --nostringval--
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --
nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --
nostringval-- false 1 %stopped_push 1 3 %oparray_pop 1 3 |
|
R*******y
发帖数: 19 | 21 以前安装一个CTeX 2.7.0的安装包都不会出现什么问题。最近在一台新的台式机上装了
这个包，对一个LaTeX文件编译生成DVI文件后（按了WinEdt中 “LaTeX”那个按钮，保
险点按两次，再按“放大镜DVI”那个按钮，用YaP打开DVI文件，却报错如下（见文后
贴的错误报告）。
然而，经检验，DVI文件的确成功生成了，我通过DVI->PS->PDF转换后，可以成功地生
成希望得到的PDF文件。这样看来，LaTeX 文件本身的编译应该是没有问题。就不知道
问题出在哪儿了。莫非是DVI查看器这个软件出错了？重装了一遍CTeX包，也无济于事
。向各位大侠请教该如何解决。谢谢！
[错误报告]
MiKTeX Problem Report
Message: The page could not be rendered.
Data: Error: /syntaxerror in -file-
Operand stack:
40258431 52099146 1000 600 600
Execution stack:
%interp_exit .runexec |
|
c******a
发帖数: 16 | 22 请问在WinEdt里面怎么设啊，我用Texify编译通过了后在弹出来的Yap中不停地报错，
什么invalid argument、Some PostScript specials could not be rendered：
MiKTeX Problem Report
Message: Some PostScript specials could not be rendered.
Data: Error: /undefined in H.S
Operand stack:
--nostringval-- PermitFileReading --nostringval-- PermitFileWriting
--nostringval--
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --
nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --
nostr... 阅读全帖 |
|
y****e
发帖数: 1012 | 23 set term postscript eps color blacktext "Helvetica" 24
set output 'p1.eps'
set autoscale # scale axes automaticallyun
set label # remove any previous labels
set xtic auto # set xtics automatically
set ytic auto # set ytics automatically
set title "I/O Traffic"
set xlabel "Interval(5s)"
set ylabel "Data(KB)"
set key 0.01,10000
set xr [0:100]
set yr [0:10000]
plot "p1.tmp" using 1:2 title 'r0' ... 阅读全帖 |
|
h****h
发帖数: 123 | 24 MikTeX2.9+winedt 6
在winedt中更改Execution modes中ps2pdf的纸型会产生如下错误：
Command Line: ps2pdf.exe -sPAPERSIZE=letter "filename.ps"
Startup Folder: C:\Users\usr
Unknown paper size: ().
Error: /undefinedfilename in (letter)
Operand stack:
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --
nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --
nostringval-- false 1 %stopped_push
Dictionary stack:
--dict:1157/1684(ro)(G)-- --dict:0/20(G)-- ... 阅读全帖 |
|
q***z
发帖数: 543 | 25
When I use int,more errors appears such as"/tmp/cc6IVNzB.s:142: Error: suffix
or operands invalid for `push'"
Could you tell me what cause it.
Thanks a lot!!! |
|
c****p
发帖数: 6474 | 26 && 和 ||是用于标量的逻辑判断，结果是一个标量逻辑值。
& |可以用于矩阵和向量的逻辑操作，结果是对应的矩阵和向量。
>> [1:2] || [0 0]
??? Operands to the || and && operators must be convertible to logical scala
r values.
>> [1:2] | [0 0]
ans =
1 1
>> [1:2] & [0 0]
ans =
0 0
>>
测试环境：7.1.0.246 (R14) Service Pack 3
另外&&（||）在第一操作数为0（1）的时候直接给结果，不对第二操作数求值。 |
|
s*******y
发帖数: 44 | 27 用A%B取模，给我的错误信息是Operator % is only supported when the second
operand is a power of 2.
可我搜到的例子里后一个数什么值都有，难道是我用的这个版本才有这种特殊要求（我
用的是XILINX）？这个问题有什么办法解决么？我必须要用这个运算。 |
|
g*******y
发帖数: 1930 | 28 寄存器都是32位的，所以ALU的operand也是32位的，除非硬件上另外集成了功能，否则
没法真正直接单独操作bit的。 |
|
c****p
发帖数: 6474 | 29 molecular electronics好像是以分子做为计算单元，通过某种手段调整分子内电子云波
函数的相干方式从而实现目的运算。目前的难题是如何实现任意operator和operand的装
载和结果的读取。
我从cnbeta上看到一个最近的报道说可以通过激光实现上面这些操作。
一家之言，仅仅取自cnbeta的这篇报道。 |
|
r*****t
发帖数: 286 | 30 ☆─────────────────────────────────────☆
yaj (好玩) 于 (Wed Feb 28 10:33:35 2007) 提到:
long value;
...
value &= 0xFFFF;
编译总是出错：error: invalid operands of types `
function type>' and `long int' to binary `operator<<'
请高手指点。
☆─────────────────────────────────────☆
soar (无意) 于 (Wed Feb 28 10:46:53 2007) 提到:
I don't think the error message points to the bitwise OR line.
Which compiler are you using?
☆─────────────────────────────────────☆
yaj (好玩) 于 (Wed Feb 28 11:03: |
|
i*****r
发帖数: 1302 | 31 我一直用&&和||,但今天用&&的时候,告诉我
Operands to the || and && operators must be convertible to
logical scalar values.
我读了help文件,还是没看明白 |
|
l******9
发帖数: 579 | 32 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: solve equations of integrals in python
发信站: BBS 未名空间站 (Fri Mar 21 12:21:31 2014, 美东)
I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, ... 阅读全帖 |
|
D*********t
发帖数: 5748 | 33 Differences compared to SAS expressions:
Character operands are not quoted.
Ranges such as 1 <= &x <= 10 behave differently.
The IN operator does not require parentheses. |
|
l******9
发帖数: 579 | 34 I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, b,c) * (x/b)**(c-1) * sym.exp(-x/b)
def g(x, b, c):
c = 1+c // TypeError: unsupported operand type(s) for +: 'int' and '
tuple'
L = 1
u = 10
... 阅读全帖 |
|
z*******n
发帖数: 1034 | 35 http://www.informit.com/articles/printerfriendly/2211695
Introduction to "The Java Language Specification, Java SE 8 Edition"
By James Gosling, Gilad Bracha, Alex Buckley, Bill Joy, Guy L. Steele
Date: Jun 12, 2014
The Java® programming language is a general-purpose, concurrent, class-
based, object-oriented language. It is designed to be simple enough that
many programmers can achieve fluency in the language. The Java programming
language is related to C and C++ but is organized rather dif... 阅读全帖 |
|
l******9
发帖数: 579 | 36 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: solve equations of integrals in python
发信站: BBS 未名空间站 (Fri Mar 21 12:21:31 2014, 美东)
I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, ... 阅读全帖 |
|
