Series要求x处是一个符号，而x被赋值从而被计算为值6。使用Clear清除定义即可
General::ivar: 0.000408` is not a valid variable.NDSolveValue::dsvar: 0.` cannot be used as a variable. General::munfl: Exp[-1080.] is too small to represent as a normalized machine number; precision may be lost. General::ivar: 0.` is not a valid variable.General...
按课程标准的内容组织，运用 Mathematica 的计算和图形功能，形象的获取数学对象的直观展示，避免了繁重的...
Fit[fp, {1, x}, x]为什么显示出来会出现负值,并且做不出图,错误提示为General::ivar: 1 is not a valid variable. 相关知识点: 试题来源: 解析没有显示负值啊……那个,不是说坐标轴以下的就是负值,你看看坐标轴的刻度嘛.这是mathematica为了显示"美观"而自动调整的坐标轴刻度,要手动调整下可以用...
z)\)\)])\), \(0.69\)])\), \(1/0.69\)]] \[DifferentialD]z\)\), 6 <= x3 <= x4 <= 10}, {x3, x4}]结果显示 Maximize::ivar: 7 is not a valid variable. 我有一扇蓝色的窗子 安装激活 1 Repentanze For循环 7 显然你在前面已经定义了x3和x4,需要先清除它们的定义 ...
+(z[1682.38]/. {(z^\[Prime])[t]==1.,z[9.70305 +23.5926 I]==1.})} is not a ...
③ The integral variable is not necessarily a single symbolic variable, but can also be a function such as sin x. ④ If integration is not possible, Mathematica will retain the original integral formula. If the original formula contains constant coefficients, Mathematica will add the constantcoeffi...
原因在于函数 Plot 执行的是非标准计算，那个 Table 并没有生成列表，要想实现输出级数的各阶展开，必须改变 Table 语句的执行次序，也就是用 函数 Evaluate 将 Table 语句先于 Plot 执行。f[x_] = Sin[x];Export["e:\\sin(x).jpg",Show[Plot[f[x], {x, -2 \[Pi], 2 \[Pi]},Plo...
③ The integral variable is not necessarily a single symbolic variable, but can also be a function such as sin x. ④ If integration is not possible, Mathematica will retain the original integral formula. If the original formula contains constant coefficients, Mathematica will add the constant coef...
AlthoughMathematicaallowsafunctiontobedefinedintermsofavariable,asinf[x_]=x 2 ,the variablexactsasa“dummy”andisinsignificant.Thefunctionwouldbethesamehadweusedy,z,or anyothersymbol. A“pure”functionisdefinedwithoutreferencetoanyspecificvariable.Itsargumentsarelabeled#1, #2,#3,andsoforth.Todistinguishap...